When I was pg with my DD in my naivity I went and bought all 000. My family has a history of prematurity due to PE. My DD was born weighing 3lb 3oz. A 000000 swam all over her it wasn't until she was atleast two weeks old and out f the humidicrib that I was able to dress her. Due to her length though she was in these for a week and straight into 00000 for the next couple of months. We've had a brief spell in 0000 and are just getting into 000 now that she is almost 5 months old.