Honest diapers run really really small ?

My 5 month old boy is wearing size 5, so I’m assuming honest brand runs REALLY small. He’s chunky and has a chunky tummy too but damn. Size 5? Anyone else have this happen with their bebes?

Edit: Yes the size 5 is a good fit for him because the size 4 was literally falling off throughout the day because we had to stretch the tabs so much to get it to fit. It was ridiculous. Also he’s in 9mo clothing if that helps