Quick answer: The most useful Christmas clothes for a 1-year-old are things they'll wear all winter: a knit romper or outfit one size up, clip-on mittens and a warm hat, and a sleep sack in the exact size. The Canadian Paediatric Society says babies don't need blankets when they sleep, so a wearable sleep sack makes a practical gift.
Shopping for a first Christmas after the first birthday is tricky. A 1-year-old doesn't need more toys than they can reach, but they do outgrow clothes quickly, spend more time on their feet and head outdoors in the cold for walks and snow play. Clothes are the gift parents actually use, as long as the size and the season are right.
This guide is built for gift-givers: grandparents, aunts and uncles, friends and parents filling a stocking. It explains how to choose a size you can't try on, what a 12-month-old is doing day to day, and which kinds of clothing get worn most in December, January and February. It is not a party-outfit guide; for that, see our first birthday outfit guide for boys and girls. For baby gifts for other occasions, from showers to newborn visits, see our baby clothes gift guide.
What this guide covers:
- How to pick a gift size: 12M vs. 18M vs. 24M vs. 2T, with brand size charts
- When to size up, and the gifts you shouldn't size up
- What 1-year-olds are doing, and which clothes help
- Gift ideas by category: everyday knits, outdoor winter gear, sleep and holiday outfits
- Tags, returns and timing, plus an easy way to skip the size question
This article is general information, not medical advice. Talk to your child's health-care provider about sleep, growth or any health concern.
What Size Should You Buy as a Gift for a 1-Year-Old?
For most clothes, buy one size up from the child's age: an 18-month size for a baby who just turned 1. Clothing sizes are based on height and weight, not birthdays, and a gift opened in December needs to fit through the rest of winter. Then check the brand's size chart, because sizes don't line up from one brand to the next.
Why is one size up the usual rule?
A 12-month size is made for a child who is around 12 months old right now. If the baby turned 1 in September, a 12-month romper may already be snug by Christmas and too short by February. Sizing up gives the gift a full season of wear.
If you can, ask the parents for the child's current height and weight, or the size they're wearing now. That one text message will do more than any rule of thumb.
12M vs. 18M vs. 24M: what's the difference?
Each size covers a height and weight range. Here's what two brands list on their own size charts:
| Size | Deux par Deux lists | Hatley lists |
|---|---|---|
| 12 months | 71–74 cm (28–29.125"), 20–23 lb | 9–12m: 71–74 cm, 21–25 lb |
| 18 months | 75–81 cm (29.5–31.875"), 23–25.5 lb | 12–18m: 74–79 cm, 25–27 lb |
| 24 months | 82–86 cm (32.25–33.875"), 25.5–27.5 lb | 18–24m: 79–84 cm, 27–30 lb |
| 2 / 2T | Size 2: 82–86 cm, 25.5–27.5 lb | 2T: 84–91 cm, 30–33 lb |
Sources: the Deux par Deux size guide and the Hatley size chart. Always check the chart for the brand you're buying.
Two things stand out. First, the same child can fall into different labels at different brands. A 25-lb toddler sits at the top of Deux par Deux's 18-month range but at the start of Hatley's 12–18 month range. Second, some brands label sizes by a single age (12m, 18m, 24m) while others use a span (12–18m, 18–24m). A span like Hatley's 12–18m (74–79 cm) overlaps more with Deux par Deux's 18m (75–81 cm) than with its 12m, so read the numbers, not just the label.
How does 2T compare with 24 months?
It depends on the brand. On the Deux par Deux chart, 24m and size 2 share the same height range (82–86 cm). On the Hatley chart, 2T starts at 84 cm, where 18–24m ends, so 2T is the next step up. For a 1-year-old, 2T is usually a gift to grow into next winter, not one to wear this season. If you want something that fits now and later, 18 months is the most practical middle ground for most babies who just turned 1.
Which gifts should you not size up?
Three categories work differently:
- Sleep sacks. The Canadian Paediatric Society (CPS) says: "If you use a sleep sack, make sure it is the right size for your baby. If it's too big, your baby's head can slip down inside the sack, which can cause your baby to overheat or suffocate." Choose the size range that matches the child today; compare options in baby sleep sacks.
- Pajamas. Health Canada advises parents to "dress them in size-appropriate sleepwear" and warns that "sleepwear that's too big can come into contact with an ignition source more easily and may burn more quickly." Buy pajamas in the size that fits now.
- Some snowsuits. Deux par Deux lists its Baby Original puffy one-piece snowsuit as fitting generously and says it advises not to size up. Check the "Fit" note on the product page before choosing a bigger size.
Accessories often come in wide ranges, such as 12/24m mittens or 18/24m hats, which take some of the guesswork out of gifting. Our baby clothes size guide explains how to measure height and weight if the parents want to check, and the snowsuit size guide covers outerwear fit in detail.
What Are 1-Year-Olds Doing, and Which Clothes Help?
Around the first birthday, many babies are pulling up, cruising along furniture and taking their first steps. That means clothes need to move, open easily for changes and handle crawling knees. The American Academy of Pediatrics (AAP) milestone list for 12 months includes "Pulls self up to stand," "Walks holding on to furniture" and "May walk two or three steps without support."
Movement: they're on the go
A child who cruises and crawls needs clothing that doesn't bunch at the hips or ride up at the waist. One-piece rompers work well because there's no gap at the middle when they bend and climb. Look for knit fabrics and roomy cuts. Deux par Deux, for example, describes the fit of its knit rompers as "relaxed."
Dressing: they help (sometimes)
The AAP lists "Extends arm or leg to help when being dressed" as a 12-month milestone. That helps, but a wriggly toddler still makes changes a two-person job. Gifts with simple openings get worn more: shoulder buttons that widen the neckline, buttons along the legs or back, and full-length zippers on sleep sacks. Skip outfits with many tiny fasteners, delicate trims or stiff fabrics that make every diaper change harder.
Outdoor time: they're more interested in the snow
One-year-olds in Canada and the northern U.S. spend winter days in strollers, on short walks and in the snow. The CPS notes that "Babies and toddlers are more at risk of frostbite since they don't move as much and can't tell us when they are cold." Warm accessories, including a hat that covers the ears and mittens that stay on, are some of the most-used gifts of the season.
Sleep: the blanket question
Many 1-year-olds still sleep in a sleep sack. The AAP advises parents to "Keep soft objects & loose bedding out of your baby's sleep area," and adds: "If you're worried about your baby getting cold, you can dress them in layers of clothing or use a wearable blanket." The AAP notes these recommendations "are for babies up to 1 year of age," and many families keep using a sleep sack well past the first birthday. If you're not sure, ask the parents what their child sleeps in now. Our guide on when babies can sleep with a blanket covers the transition in more detail.
Which Clothing Gifts Do 1-Year-Olds Actually Wear?
The gifts that get the most wear are the ones that fit into the family's daily routine: an everyday outfit, outdoor gear for winter walks, something for sleep and, if you like, one special piece for the holidays. Below are ideas by category, with examples from Deux par Deux pieces at Jenni Kidz. Sizes change quickly in December, so check the product page before you order.
Everyday knits: rompers and dresses
A knit romper is warm, easy to dress and covers from neck to ankle, so there's no gap at the back when a toddler crawls. Two examples:
- Knitted Romper Dusty Pink: Deux par Deux lists dusty pink and off-white stripes with three small flowers on the chest, shoulder buttons that let the neckline open wide, and buttons at the bottom of the one-piece. The brand lists a 50% viscose, 28% polyester and 22% nylon knit with ribbed cuffs and a relaxed fit. For a 1-year-old, look at 12m or 18m.
- Knitted Intarsia Romper Blue and Orange: a grey romper with navy sleeves, striped legs and an orange car knitted into the chest. Deux par Deux lists back buttons, ribbed cuffs and a relaxed fit in a knit of 40% nylon, 30% acrylic, 24% polyester and 6% wool. For a 1-year-old, look at 12m or 18m.
For a dress, the Baby Knitted Dress Pink has ruffled shoulders, embroidered chest flowers and a pleated skirt, with long raglan sleeves, as Deux par Deux lists. It comes in 12m, 18m and 24m. Pair it with tights so it works for crawling. For more choices, browse baby girls' one-pieces and baby boys' one-pieces, or see our guide on how to choose baby rompers.
Outdoor winter gear: hats, mittens and snowsuits
Winter accessories are practical, easy to size and small enough to wrap. The CPS advises families to "Always keep ears covered to prevent frostbite" and to "Wear mittens instead of gloves so that fingers can be bunched together for warmth."
- A hat that covers the ears. The Baby Winter Knit Hat With Ear Flaps and Ears Off-White has bear ears on top, ear flaps and chin ties, with a polar fleece lining, as Deux par Deux lists. For a child who just turned 1, look at 9/12m or 18/24m; 18/24m leaves room to grow.
- Mittens with a clip, not a string. The CPS recommends using "mitten clips instead of a string to prevent choking." The Play Baby Winter Mittens Dusty Pink come in size 12/24m, which Deux par Deux lists for a child measuring 71 to 86 cm (28 to 33.75 in). The brand lists a rubberized palm, an elastic wrist, an extended cuff and an attachment clip for snowsuits. To see when kids are ready to move from mittens to gloves, read our guide to mittens vs gloves for toddlers and kids.
- A snowsuit, if the parents agree. A snowsuit is a bigger gift, so it's worth asking first. The Baby Original One-Piece Puffy Snowsuit in Black comes with removable fleece-lined mittens and booties plus a neckwarmer, and Deux par Deux gives it a -30°C (-22°F) rating. Toddler sizes run 12m, 18m, 24m and 30m/2T. Remember the brand's note: it fits generously, and the brand advises not to size up.
Browse more in winter accessories, kids' gloves and mittens, baby girls' snowsuits and baby boys' snowsuits. For what to layer underneath, see how to dress an infant for winter.
Sleep: a sleep sack in the right size
A sleep sack is one of the few gifts that gets used every single night. The Plush Sleep Sack Off-White is a sleeveless wearable blanket with a heart and flower embroidery and a full-length zipper, according to Deux par Deux. The brand lists a 100% polyester plush outer and a 100% cotton lining, in sizes 0/6, 6/18 and 18/36 months. For a 1-year-old, the choice is usually between 6/18 and 18/36 months.
Which range to pick depends on the child's size today, not on growing room. Follow the CPS advice above, and ask the parents which size their child is in now. Compare more options in baby sleep sacks.
A few sleep-related reminders for gift-givers, all from the CPS:
- "Babies do not need blankets when they sleep. Blankets can cause them to overheat or suffocate."
- "Take off bibs, necklaces, items with ties or hoods, and hats before putting your baby to sleep to prevent strangulation."
So a hat or hooded sweater is a daytime gift, and a sleep sack or one-piece sleeper is the night-time one.
A holiday outfit they'll wear more than once
If you'd like to give something festive, choose a piece that works beyond December 25. The Baby Top & Pants Set Blue and Green Checks pairs a checked bodysuit with navy suspender pants, from Deux par Deux's Christmas Couture collection, as the brand lists. For a 1-year-old, look at 12m, 18m or 24m. A plaid bodysuit can go with jeans in January, and the pants work with a plain sweater. Holiday pieces are often made in small quantities, so browse the holiday collection and check sizes early. For more festive looks for the whole family, see our holiday outfit ideas for kids and babies. For Christmas Day outfits by age, from newborn to 24 months, see our baby's first Christmas outfit guide.
How Do You Build a Gift Set Without Guessing?
Pick one piece from two or three categories instead of three pieces from one. A set that covers different moments in the day gets used more than three outfits in the same size. If you'd rather give a set that's already put together, the Mayoral 3 Piece Gift Set Baby pairs a footed one-piece with a dotted hat with ears and a bib, in ivory with lion safari artwork. Mayoral lists it in sizes 6-9M and 12M, so it suits a 1-year-old who still fits a 12-month size. Here are combinations that make sense for a 1-year-old in winter:
| Gift idea | What to include | Size tip |
|---|---|---|
| Winter walk kit | Warm hat that covers the ears + clip-on mittens | Choose the range that covers 12–24 months |
| Cozy everyday set | Knit romper + tights or socks | One size up (usually 18m) |
| Bedtime gift | Sleep sack + one-piece sleeper | Exact size for the sleep sack; check the brand range |
| Holiday-and-beyond | Festive set that mixes with plain basics | One size up so it still fits in February |
| Big outdoor gift | Snowsuit (ask the parents first) | Follow the brand's fit note; some say not to size up |
Avoid gifting a whole wardrobe in one size. Children grow on their own timeline, and spreading sizes (one piece in 18m, one in 24m) means something fits now and something fits later.
What Should You Avoid When Gifting Clothes to a 1-Year-Old?
The biggest misses are clothes that are the wrong size for the season, hard to put on, or not suited to the child's daily life.
- Summer clothes in December. A short-sleeved outfit in 12m will likely be outgrown before the weather warms up. If you love it, buy it in a bigger size.
- Too many tiny fasteners. Back zippers, many small buttons or stiff collars make every change harder for a toddler who won't stay still.
- Mittens on a long string. Follow the CPS advice and choose clips instead.
- Blankets and pillows for the crib. They're popular gifts, but the AAP and CPS both advise keeping them out of a baby's sleep space. A sleep sack or sleeper is a better choice.
- Party-only outfits. A first birthday dress or a formal outfit may be worn once. If the family has an event coming up, ask first. Otherwise, choose pieces that work for daycare, visits and photos.
- Guessing the size for big items. For snowsuits and sleep sacks, ask the parents or give a gift card.
What About Tags, Returns and Gift Timing?
Keep the tags on, keep the packaging and check the store's return policy before you wrap. Return windows are often shorter than the time between buying a gift in November and opening it at Christmas, so it pays to sort out size questions early.
At Jenni Kidz, the Return and Refund Policy asks customers to email the store "within 14 days of receiving your item" to start a return, and says: "To be eligible for a return, your item must be in the same condition that you received it, unworn or unused, with tags, and in its original packaging." The policy also notes that "Items sent back to us without first requesting a return will not be accepted." Read the full policy before you order.
Practical steps for gift-givers:
- Ask about size before you buy. A quick message to the parents is the easiest fix.
- Open the box when it arrives. Check the size and colour right away, while there's still time to sort out a mix-up.
- Leave tags on and keep the packaging. Wrap the gift in its original bag or box if you can.
- Tell the parents where it's from. Include the store name, so they know where to look if they have a question.
Can a gift card solve the size problem?
Yes. If you don't know the child's size or the parents' taste, a gift card lets the family choose the size and colour themselves. Jenni Kidz offers a digital gift card that can be sent to you or straight to the recipient, with an optional personal message. A card paired with a small wrapped item, like a hat or a pair of mittens, still gives the child something to open.
Frequently Asked Questions
What size clothes should I buy for a 1-year-old's Christmas gift?
For most clothes, buy one size up, usually 18 months, so the gift fits through winter. Check the brand's size chart, because sizes vary. Don't size up sleep sacks: the Canadian Paediatric Society says a sleep sack should be the right size for the baby.
Is 18 months or 24 months better for a baby who just turned 1?
For most babies who just turned 1, 18 months fits now with room to grow. 24 months is a good choice for a larger baby or for something to wear next season. Compare the child's height and weight with the brand's chart.
Is 2T the same as 24 months?
Not always. On the Deux par Deux chart, 24m and size 2 share the same height range (82–86 cm). On the Hatley chart, 2T starts at 84 cm, where 18–24m ends. Read the numbers on the chart, not just the label.
Is a sleep sack a good gift for a 1-year-old?
Yes, if it's the right size. The AAP suggests a wearable blanket instead of loose bedding, and the CPS says babies do not need blankets when they sleep. Ask the parents which size range their child uses now.
What winter clothes do 1-year-olds use most?
A warm hat that covers the ears, mittens that stay on and a snowsuit for outdoor time. The CPS recommends mittens instead of gloves so fingers can be bunched together for warmth, and mitten clips instead of a string.
Should I keep the tags on clothing gifts?
Yes. Return policies usually require tags and original packaging. Jenni Kidz's policy asks customers to request a return within 14 days of receiving the item, so check the size as soon as the order arrives.
What if I don't know the child's size?
Ask the parents, choose accessories with wide size ranges, such as 12/24m mittens, or give a digital gift card so the family can choose the size themselves.
Bottom Line
The most-worn clothing gifts for a 1-year-old match their real winter: moving, crawling, heading outside and sleeping in a sleep sack. Buy everyday clothes one size up, keep pajamas, sleep sacks and some snowsuits true to size, choose clip-on mittens and a hat that covers the ears, and check the return policy before you wrap. When in doubt, ask the parents or let them choose with a gift card.
Sources
- Canadian Paediatric Society, Caring for Kids: Safe sleep for babies (last updated October 2021)
- Canadian Paediatric Society, Caring for Kids: Winter safety: Advice for parents and kids (last updated February 2023)
- Canadian Paediatric Society, Caring for Kids: Frostbite (last updated February 2023)
- American Academy of Pediatrics, HealthyChildren.org: How to Keep Your Sleeping Baby Safe: AAP Policy Explained (Rachel Y. Moon, MD, FAAP)
- American Academy of Pediatrics, HealthyChildren.org: Developmental Milestones: 12 Months
- Health Canada: Children's sleepwear safety (date modified 2025-11-03)
- Deux par Deux: Size Guide
- Hatley: Size Chart
