allergic

salam mommy,just inquiry..ibu-ibu ad x baby y allergic susu mcm ank sy?ank sy baru nk msuk 3 bulan dan sblm ni dia fully bf..but recently susu bdn sy mula drop dan sy mula bg susu formula started with dupro as suggested by some mommy.but my baby started got simptom like pimples.Mommy ad suggestion x any brand yang mybe ok?actually my baby admitted in hospital before because gbs,on antibiotic 5 day and need to bf fully because he refuse formula and vomit.