While Mei Tais are not as structured as Buckle Carriers there are differences in how they fit. Each child/adult duo will find some more comfortable than others.
For newborns – we recommend either a Mysol or DidyTai (both of which have waists that cinch narrower) or a BBtai which has an infant insert.
Once your baby is 4-6m and has good head control (and is wearing size 0 clothing) any baby size carrier will fit.
For children over a size 2 we encourage you to consider a toddler size conversion.
Some people love wrap straps, other people prefer padded straps. While it is purely personal it does seem that very small adults generally don’t love the way wide wrap straps fit.