NaN optipro 1 servere cramps

A friend purchased a tin of nan optipro 1 and her new born baby was getting cramps .she then assumed it was because her baby was allergic and gave it to me . My 4 month old has been using that tin for the past week and is experiencing the same cramps ,the expiry date on the tin says 2022 . We have had sleepless nights with a crying baby not thinking it could be the milk. Its very expensive and to have such problems for babies is totally unacceptable. Im disappointed in the brand