We did at like 7 weeks. We ran out of 1s and I had 2s here. I think they start at 12 lbs which he was about that then. The ones just werent holding the pee well anymore
DS has been in them for quite some time, and I am about to put him in 3s overnight. I guess that's what you get when you deliver a 10 and a half pound baby! He was only in size 1 for a couple weeks! Eek!
My son is almost 3 months old and still in size ones. He's 11.6lbs now. I'm going to guess he'll be in them when he's 4 months based on his weight gain (about 2 pounds a month).
Around 10 weeks. He was blowing out the 1's and they were so tight on him. I tried to make them work but ended up having to give the opened ones away. He was right around 12 lbs but he has a big belly and powerful poops.
We just started using size 2's last week. DD was 10 weeks. I tried 2's when DD was right at 12 lbs (about 7 weeks, I think) but they were still a little big on her. The reason I tried the 2's was because I did not have any more size 1's. I ended up buying a few packs of size 1's and when those ran out last week, I started using the 2's again and they fit much better. DD is at least 13 lbs now, maybe even more.
We may be moving into them soon. I might buy a small package of #2's just too see. The #1's seem a little tight now. If the 2's work out I will finish up what I have opened and try to exchange the #1's.
We just moved to NB at 6 weeks ago. We have close to 300 NB's left, at which time she'll probably be ready to move to 1's. She's 8 weeks today, and 9.7 lbs. She was only 5.5lbs at birth.
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Re: at what age ... size 2 diapers