I sized up to size 2 when she started having occasional leaks and red marks round her legs x
My lo is 10lb 4 and we are on size 2 pampers x
I just ignore the sizing on the packets and go by what fits, same with clothes. With my first I always found we sized up way before the weight the nappy packets say 🤷 we've been using size 2 since baby was a week old and he isn't a big baby.
Baby is 5 weeks and we’re on size 3. We sized up to size 2 pretty early on due to leaks, and then there were lots of red marks around his legs so sized up to 3 in the last couple days.
My baby is about 9lb or over now too (was 8lb 12oz over a week ago) and feeling the same. I found with my first that it’s more to do with length of baby as well as chunkiness! Just move to the size you’re comfortable with. We have about 20 size 1 nappies left then I’ll be moving up to 2s.