Free tool · Newborn
Baby Clothes Size Predictor
Predict which size to buy for next season, brand by brand.
Enter your baby's current height, weight and age, pick a month, and see the likely size for popular brands.
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Enter your baby’s age to see likely sizes by brand.
Estimate for shopping only — babies grow at their own pace. This is not a growth assessment.
What to do next
Printable
Weekly baby sleep log
Note naps, bedtime and night wakes for a week to spot your baby's rhythm.
How it works
We compare your baby’s height and weight with a typical baby of the same age, then assume they stay in about the same place as they grow. That gives an estimated height and weight for the month you pick, which we match against each brand’s size chart. When height and weight point to different sizes, we suggest the bigger one.
The reference curve is based on the WHO Child Growth Standards (approximate medians, averaged for girls and boys). It’s a shopping estimate — babies grow at their own pace.
Frequently asked questions
Why do brands differ?
Every brand cuts differently. Some run small, some large — that’s why we check each brand’s own chart.
Is this a growth check?
No. It only estimates clothing sizes. Talk to your healthcare provider about your baby’s growth.