formula making babies fat?

[Caezzybe]

As far as I know, the hungry milks have the same calories as the non-hungry milks but contain something to make them a bit harder to digest?

Yes that's right. Milk protein is made out of casein and whey. Normal formula has a casein to whey ratio of 40:60 (similar to breast milk) and hungry baby formula has a casein to whey ratio of 80:20 (similar to cow's milk). They still contain roughly the same amount of energy.

Thanks for pointing out the difference, I didn't realise that the hungry milk was closer to cow's milk and have switched back to the non-hungry milk. It didn't seem to make a difference to how hungry LO is anyway and I would rather he had something more like breast milk. The othet stuff was also making his poo smell funny and he was doing smelly bottom burps on it