Abbott — Similac stage 2 bad smell

We have also used similac formula 9 months for our new baby . After feeding she is having stomach ace, vomiting and crying badly . We consulted to doctor . we checked after diluted to water gives very bad smell after 1 day feed to my 2 kids(twins) then we realise this is the reason for kid crying badly. It's very second time we facing the problem please take the needful action on this. How can someone adulterate food, attest for infants who can’t even speak .