This model has a pretty generous fit so it will suit children 6 - 24 months. (verywellfamily.com)
We've never had to size - up our little one's clothing to compensate for her cloth diapers, even with the more generous fit of the Omni. (theclothdiaperwhisperer.com)
If I wanted to wear this top with jeans, I'd size up to a 2x for a more generous fit through the tummy and hips. (withwonderandwhimsy.com)