when did you're little one go into size 1 diapers

around a month and a half but some babies don't fit newborn diapers and go straight to ones we only used one big box of one's then went to twos she's four months now and in 3s when they're done were getting size 4 because they will fit her better

3 weeks old

One week old... 10lbs 2oz at birth though hahahha