Baby Clothing Size Chart by Age Guide
Use a baby clothing size chart by age, height and weight with newborn, infant and toddler sizing tips plus links to kids size converters.
Baby clothing labels are convenient, but age is only a rough guide. Height, weight and diaper room matter more than the month printed on the tag. Start with the Kids Size Converter to compare age, height and weight ranges before choosing newborn, infant or toddler clothing.
Newborn and 0-3 Month Sizes
Newborn sizes are usually designed for smaller babies, while 0-3 month sizes allow more room for early growth. If the baby is close to the upper weight range at birth, 0-3 months may be more practical than buying many newborn pieces. Check shoulder snaps, diaper space and leg length for comfort.
Infant Sizes From 3 to 12 Months
Infant sizes vary widely by brand. Some labels run slim and long, while others run wider for diaper room. Use height and weight as the main reference, and compare regional labels with the Clothing Size Converter if buying from international stores.
Toddler Transition Sizes
As babies start walking, clothing fit changes. Pants need room for movement, tops should not restrict shoulders, and shoes require accurate foot measurement. Avoid relying on age alone once a child becomes more active, because height and proportions can vary even more during toddler years.