All In One Size Chart
XS (Extra-Small) fits from 6-12 pounds. It is intended for a newborn and fits low, below the navel, to keep the umbilical area dry. This diaper is designed to fit during that itty-bitty newborn stage. The extra small diaper does not have a pocket opening.
S (Small) fits from 8-16 pounds. This diaper is slightly larger with a higher rise than the XS. It is intended for after your baby's umbilical cord has fallen off.
M (Medium) fits from 15 - 22 pounds.
L (Large) fits from 22 - 30 pounds.