Start his winter outfit with a warm first layer. These baby boys base layers are one-piece thermal jumpsuits by Deux par Deux, offered in a blue gradient dinosaur print, a blue and beige gradient and a smiley face print, with baby sizes from 6M to 24M.

Made in thick, super soft brushed jersey, each suit has long raglan sleeves, a round neckline and an asymmetrical zipper, and it is designed to sit under a snowsuit without restricting movement. Sizing carries on from 2 to 14, so a big brother can wear the same print.

For snow days, layer a baby boys snowsuit on top. Stroller and car seat outings are easier with a baby bunting bag or footmuff, older boys will find their sizes in boys base layers, and the rest of his cold-weather wardrobe is in baby boys winter clothing.