Dear Joannek,
cloth diapers tend to be bulkier.. even though it depends on the kind of diaper you use and that today you can find some pretty 'slim' cloth nappies especially using hemp or terry bamboo.
Regarding the kushies and anykind of 'All-In-One' actually, don't use them with breastfed babies as you might indeed encounter leak and leak. For totally breastfed babies, just go with the 'nappy + cover' option, which is the safest (as soon as your baby starts eating something else, the poo 'structure' completely changes and then you can use which ever type of diaper you prefer)
for night time, you need more absorbency so one reason why your diapers were leaking could be either because they were not absorbent enough (and you might try to add another add-in insert) or maybe was it leaking from the belly as the kushies doesn't have any elastic on the front side and may leave it 'open' - i personnally add quite some leaks that way.
However, for time night, the safest option would also be the nappy + cover (or wrap).
but the kushies exist in both ways AIO or nappy + cover so maybe could you try the other version?
Then if your babies had diaper rash, maybe was it because of the contact with wetness and then you could try to add a microfleece inner to keep your baby dry?
regarding our hot weather, well disposable diapers are actually hotter than cloth (imagine a plastic around your baby's bottoms?) since nappy covers (or wraps) are made in breathable fabric nowadays. and for the information, the coolest option would be wool cover, than fleece and finally PUL cover...
HTH
sophie
