Baby Size Comparison Chart
Compare Newborn and 0 to 3 month clothing sizes side by side, so you know how many of each to actually buy.
How it works
- Choose Newborn, 0 to 3 months, or Compare both to focus the view.
- Check the weight and length bars for an at-a-glance sense of the size difference.
- Review the spec cards for exact measurements and recommended clothing quantities.
- Read the sizing tips below for practical shopping guidance.
Expert sizing tips
About this chart
These weight and length ranges reflect commonly published industry figures, cross-checked against real brand size charts, and are intended as a general guide rather than an exact match for every brand. Individual brands can run larger or smaller than these ranges.
The recommended clothing quantities are starting suggestions based on typical laundry habits, not a strict requirement. Adjust up or down based on how often you plan to do laundry.
Frequently asked questions
Should I buy mostly newborn or 0 to 3 month sizes?
Lean more toward 0 to 3 month sizes for most items. Newborn size fits for a short window, sometimes only a few weeks, and some babies skip it entirely, so a small number of newborn pieces is usually enough.
What if my baby is between the two sizes?
Check length as well as weight. A baby within the weight range for newborn but longer than 21 inches will likely fit 0 to 3 month clothes better, since tight or short clothing is uncomfortable regardless of weight.
Do all brands use the same cutoffs for newborn and 0 to 3 months?
No. These are general industry ranges, and individual brands can run a bit larger or smaller. Checking the specific brand’s own size chart is the most reliable approach for an exact fit.