Diaper sizes

Alli • Grace 10-8-18 ❤️❤️

I’m a first time mom and my daughter is a month old and has been in newborn diapers the whole time since she’s tiny. Well she’s 8 pounds now and newborn still fits her but she has started leaking poop out the leg holes a lot. Size 1 is still huge on her though, they fit but they’re huge. Should we go up a size at this point? We literally JUST bought another box of newborns