i don't think there is any set amount of weight you should or shouldn't gain. from 17-25weeks i gained 2.5kg (the first gain after losing about 10kg to start out) from 25-29 weeks, i lost half a kilo. go figure! baby is definitely growing and so is my tum, so i must be losing it from other parts of me... i was bigger to start with, so no one is concerned with the loss.

the average gain is about 6-13kg i think, but it really is variable depending on what happens in your circumstances. we had bushfire here the weekend before Black Saturday, and i'll admit in the weeks since then, my eating habits have deteriorated compared to first tri, but i still managed to lose weight in that time, so i'd say it's about your metabolism (and that of the bubba!)