I think anything is acceptable or normal if you are healthy and have no medical problems or indicators that may indicate something isn't right. I think the whole suggestion about there being a *right* amount of weight to gain during pg is unrealistic and it should be abolished because as soon as a women is outside of those parameters, then there is something wrong. Gain too much weight and you deal with "oh you're too fat to birth here/baby will be too big/fat women with fat vaginas can't give birth vaginally" or if you don't gain enough weight you get "your baby is too small we need to induce/you're too small, your baby is too big we need to induce" You can't win either way. All it does is make women worry that something is wrong if they are outside of the figures that *they* say you should be putting on. I've had a huge variation in the amount of weight I put on during pg from as little as 15kg with my last pg to 27kg with my second and I did nothing different with any of my pgs.