Baby boy pajamas for bedtime, naps and lazy weekend mornings, from 3 months to 36 months. Pick an organic cotton one-piece for the youngest babies, a two-piece set for toddlers, or a short loungewear set for warm summer nights.

Deux par Deux has the widest choice, from a baby one-piece in a beige airplane print (3 to 24 months) to organic cotton two-piece sets with monster, crocodile, dog and baseball prints starting at 12 months. Hatley organic cotton sets in 9 to 24 months feature leaping frogs, construction trucks and arctic animals, Mayoral offers a baby sleepsuit with bag in 12 to 36 months, Petit Lem has conifer and national park prints from 18 months, and Angel Dear adds the Send Snacks short loungewear set in 6 to 24 months.

Starting sleep training? Our guide to the best baby pajamas for sleep training explains what to look for, and on chilly nights you can pair his pajamas with a wearable blanket from baby sleep sacks.

When he moves past 3T, head to boys pajamas, and find more everyday pieces in baby boys one-pieces and baby boy clothing.