Maybe try a lactose free formula, everyone was telling me DD was suffering reflux and to try the AR forumla and thickeners as DD was a vomitor and losing weight. She would bite me when breastfeeding so I ended up trying the S26 LF formula and she stopped vomiting and has thrived ever since. Looking back at photos of her when she was breastfeeding she looks very pale and sickly. Your breastmilk contains lactose regardless of what you eat so it could be the problem, DD improved on the regular S26 Gold formula but the vomiting only completeley stopped once she stopped breastfeeding and went onto the lactose free formula.

It could be that he knows that he doesn't feel well when having a feed so he doesn't want it? DD was like that too but she was eight months. the S26 LF formula is available at Coles, Safeway/Woolworths and chemists.