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olive flew through p, nb, 1, 1 1.5, and 2. she's been 3 for quite some time (6 monthsish and still going). charlie was in size 4 for a year+? so 3 and 4 were def the longest wearing sizes.

We've been in size 3 diapers for the longest. DS (11 months) has been in them for several months and I don't see us moving up anytime soon.

He is still in size 2 at six months, so I'm not sure about the higher sizes but I would think that, likes @mrs bee said, 3 or 4 would be the longest? They don't grow quite so rapidly once they get to 9mos-1 yo.

He was in NB for about a month - which surprised me. BUT he also fit into sz 1s at the time, so they were interchangeable. He wasn't in sz 1 for very long and considering he is on the smaller side, I would say not many babies would be in 1 for very long. They double their birth weight pretty quickly.

I would think you're good for sz nb and 1 for sure. And maybe even sz 2...

But if you end up with extras - you can make a diaper cake for a friend or gift them to other preggo friends!

I don't remember which size my oldest wore the longest but my recommendation is to not stock up too much on NB and Size 1s. I totally overbought with BOTH of my boys and had to give two packs away for nb and 1.5 cases with size 1s. Stores will always have sales and if you want to buy larger sizes I wouldn't get more than two cases per size. Also, I noticed that Pampers Baby Dry runs a little small. My LO wears 2s now and the Baby Dry diapers are way smaller than the Sensitive/Swaddlers. Just an FYI. I didn't notice this before with my oldest but do now with my youngest.

LO is 4 months and is in size 3. She will probably be in size 3 the longest. Her thighs are super duper chubby so we definitely don't pay attention to the weights listed on the diaper and moved up a size based on how her thighs fit in the diaper.