Baby Clothing Size Prediction Calculator
See how your baby's clothing size is likely to change between now and their first birthday, based on their current measurements and typical growth patterns. Useful for planning ahead of sales.
Predicted sizes through 12 months
| Age | Est. weight | Predicted size |
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About this tool
This calculator projects your baby's likely size over the coming months by comparing their current weight and height to typical growth patterns for their age, then scaling that growth curve forward. It is intended as a planning aid for shopping ahead of sales, not a substitute for checking fit before you buy.
Predictions are shown through 12 months of age, since growth data becomes far less predictable and more individual beyond the first year. For sizing guidance past 12 months, a dedicated toddler size chart based on age, weight, and height is more reliable than projecting this far out.
Frequently asked questions
How accurate are these predictions?
They reflect a typical growth trajectory scaled to your baby's current size, which is a reasonable planning estimate but not a clinical prediction. Growth spurts, illness, and individual variation can all shift the actual numbers.
Why does the calculator stop at 12 months?
Growth in the first year follows a fairly consistent curve, which makes near-term prediction reasonably reliable. After 12 months, growth rates vary much more between individual children, so projecting sizes further out becomes far less accurate.
Should I buy clothes based on these predictions?
Use them as a guide for which sizes to watch for during sales, rather than buying a full wardrobe in advance. Babies can grow faster or slower than expected, so keeping receipts and buying a range of nearby sizes is safer than committing heavily to one predicted size.