Baby pooping out of diapers

My 2 month old is about 13 pounds and has been wearing size 2 diapers by the Honest Company but she still poops out of them (mostly on the side, sometimes back). They seem like they're a little too big for her in the waist and legs.

She also poops out of the size 1 ones since they're too small. It seems like she's in a weird transitional stage between the two sides (too small for one, too big for the other). She also poops out of size 1 pampers.

Should I buy her a different brand or just stick out the size 2s for a little longer?