Clothes for chunky babies: tummies, thighs and wrists

Let the rounder measurement lead

A shorter, heavier baby might measure 61 cm and weigh 7 kg: inside our 0–3M range for length (56–62 cm) but well into 3–6M for weight (6–8 kg). For anything that closes around the body, such as snaps across a sleepsuit or the leg openings on a romper, the rounder measurement decides. Go with the larger size and deal with the extra length, because you can turn back a cuff but you can’t add room across a tummy.

Check both numbers against our size guide and note which one is ahead of the other. That is the one to size for in one-pieces.

Where it pinches first

• Snaps down the front that strain or pop open across the tummy.
• Leg openings on rompers that press into the thighs.
• Ribbed cuffs that grip round wrists and ankles.
• Necklines that catch on full cheeks and a round chin on the way over the head.
• Waistbands that sit on top of the tummy rather than comfortably below it.

Cuts and details that give room

• Bubble-shaped bottoms. The rounded shape of our Sky Blue Sailboat Polo Romper leaves space around the nappy and thighs, and the snaps underneath make changes quick.
• Two-piece sets with an elasticated waist, which can sit comfortably under the tummy instead of across it.
• Shoulder buttons or a henley placket, so the neck opens wide. The top in our Oatmeal Teddy Ribbed Top & Jogger Set has two shoulder buttons for exactly this.
• Ribbed knits, which stretch across the body more readily than a flat, woven fabric.
• Sleepsuits that open all the way down the front, rather than anything that goes over the head.

Managing the extra length

Sizing up for the body usually means sleeves and legs that are too long. On separates, fold the ribbed cuffs back once; they stay in place better than a rolled hem. On a footed sleepsuit, spare foot length matters more, because a lot of empty space at the toes lets the fabric bunch under the feet.

For a chunky baby, a footless sleepsuit with socks, or a romper in warm weather, often fits better than a footed one a size up. Our post on footed or footless sleepsuits covers how much toe room is right when you do choose covered feet.

A quick try-on check

• Close every snap with your baby lying flat and legs straight: nothing should gape or pull into a diamond shape.
• Slide a finger under each cuff and the waistband. It should go in without pressing into the skin.
• Sit them up and look at the tummy: a waistband that folds over or rolls down is sitting too high.
• Lift their arms: the top should stay over the tummy rather than riding up to the chest.

Reading marks on the skin

A faint line from an elastic cuff that fades within minutes of taking the piece off is normal. Deep marks that linger, or cuffs you have to stretch hard to get over a hand, mean the piece is too small in that spot even if the rest fits.

Build changes as they move

Rolls and round cheeks are common in the first year, and many babies change shape once they start crawling and walking. What matters is that clothes fit comfortably now. If you have any questions about weight or feeding, your doctor is the right person to ask, not a size chart.

It also means the size that worked at five months may not be the right call at ten. Measure again before each order rather than assuming they will stay ahead by weight.

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