The thirsties duos are a bit tricky to get ahold of atm so your limited on those, i beieve peachy tots have some in stock, i would go with size 2 for soph
There are three rise settings on them so you can adjust them...they come in poppers and aplix but i would imagine the aplix is more adjustable (just thinking of how wee soph is) so you might get a better fit with that rather than poppers?
Weehuggers again, i would go with size 2...its the same as the thirsties with three rise settings. You can get those at babipur, babykind...They are a bit more expensive though...around £13 per wrap. Where as the thirsties duos are £8.75 ish.