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How many clothes per size: from birth to one year
Each size lasts a different length of time, and the quantities do not follow age. 3 month is the trap.
Paul · September 23, 2026 · 6 min read
One mistake shows up in nearly every first-year wardrobe: buying as though every size lasted as long as the one before. It does not, and the gap is considerable.
Newborn size lasts about a fortnight. The 6 month size lasts two to three months. In between, the 3 month size catches most people out.
3 month is the trap size
Everyone expects a baby to pass through it as fast as the earlier ones. In practice they stay in it six to eight weeks, three to four times longer than in newborn.
So it is the size that needs the most pieces, and also the one people buy least, because it does not look urgent during pregnancy. The classic result: twelve newborn bodysuits worn for a fortnight, and a shortage six weeks later.
How many per size
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Newborn, about 15 days: 5 to 7 bodysuits, 5 to 7 sleepsuits, 2 cardigans, 2 hats, 3 pairs of socks
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1 month, about 3 weeks: 7 to 8 bodysuits, 7 to 8 sleepsuits, 2 cardigans, 3 to 4 pairs of socks
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3 month, 6 to 8 weeks: 8 to 10 bodysuits, 6 to 7 sleepsuits, 4 to 5 outfits, 5 to 7 bibs
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6 month, 2 to 3 months: 7 to 8 bodysuits, 5 to 6 sleepsuits, 5 to 7 outfits, 7 to 10 bibs
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9 to 12 month, 3 to 4 months: 5 to 7 bodysuits, 5 to 6 sleepsuits, 7 to 8 outfits, one pair of shoes
Why bodysuits go down and outfits go up
The trend is clear and the reason is simple. A newborn lives in a bodysuit and a sleepsuit, day and night, changed several times a day. A nine-month-old goes out, eats something other than milk, and wears actual outfits.
Bibs move the other way and rise sharply: at first they are for possets, later for teething dribble and then for first meals.
Shoes only arrive at the end, and only once the baby walks. Before that they serve no purpose and get in the way of how the foot develops.
The assumption behind all these numbers
A wash every three or four days. That is the variable driving everything: run a load a day and you can roughly halve the lists above, which makes them almost comfortable.
One special case is worth noting: if the baby is in childcare, at a nursery or with a childminder, add two or three bodysuits and one or two sleepsuits to leave there. The spare change of clothes that lives at the childminder never comes back into the home rotation.
You dress a newborn twelve times a week and a nine-month-old seven times. That is not the same wardrobe, and it is not the same number.