My baby girl is almost 4 weeks old and showing no signs of outgrowing her NB clothes. She absolutely drowns in 0-3 month clothing. I expected her to be bigger and returned most of the NB gifts we were given and ended up buying some onesies when she was about a week old. Last week I bought a couple outfits and I'm tempted to buy more! She is 8lb8oz today (She seems to be eating enough based on wet/poopy diapers, and her dad was a really small baby/kid, but I still wonder if I'm feeding her enough!)