I used a
haB with DS, and had to do its up really tight before putting him in. Its normal to have to re-tighten them after 2-3 hours, not a problem with the sling as such, but it can be inconveinient.

This time I have a Kozy mei tai as well, its a lot less fuss to get on and off - and while i dont have a really bub in there yet (maybe next week?) Im hoping it will be great!