My b is 8 mths old now, he started to 厭奶 since he was 3.5 mths old. I changed the formula from Beanstalk to Meiji at that time, so the problem of 厭奶 resolved, about 2 mths later, he started to 厭奶 again, then I changed from Meiji to Sum Wing, then the problem resolved again.
So far his poo poo is ok, and since he is having solid food now, not relying on formula alone, so everything is ok by now
yes, I prefer trying different brands instead od using rice water, since not sure what is the impact of mixing rice water with formula. there is no medical proof yet, just a kind of old method telling by last generation....not very safe.
As sometimes some kind of consequence cant be observed until later stage, so I wont mix rice water with formula, even though so many mums said their babies look so healthy after taking rice water formula
I am prepared to switch back to Meiji if my b is 厭奶 again. Just like toys, if you hide their old toys away for a while, it becomes brand new toys to them again.
So you may switch back to the first or the second formula your b had b4. As long as his digestive system is ok with it.