I preferred singlet suits to just singlets and I used 000's although mine were 8lb 13 and 10 lbs so both only fit into 0000 for one week!!!! Depends how big they are but I would pack a few more suits, one poo or spew and they need a change! Also don't firget that if you need more of something you don't have you can send DH or someone out to get it!