Infant fatness peaks between 4 and 9 months of age at about 25 percent before it begins a long slow decline. This period of baby fat thinning leads to a stage in childhood when most humans have the lowest body fat percentage they will have in their lives, unless of course you're one of the not-so-lucky ones.

Are breastfed babies chubbier?

It is normal for breastfed babies to gain weight more rapidly than their formula-fed peers during the first 2-3 months and then taper off (particularly between 9 and 12 months). There is absolutely NO evidence that a large breastfed baby will become a large child or adult.

Why is my baby not chubby?

When a baby is gaining weight slower than expected, it could mean that they are not getting enough. If your newborn is not back to their birth weight in two weeks, or not gaining weight consistently after that,2 it may indicate that there's a breastfeeding issue.