Vomit after feeding

Hi mommies, my son is turning 1 month in 2 more days. eversince birth, ive been giving him formula milk and my breastmilk. However, whenever he finish feeding, he will vomit out his milk. be it breastmilk, or formula milk. At times, he'll even merlion out the milk. ive tried several milk, and all seems to be giving the same result. Able to advise on what i should do, or if there's any mommies experiencing the same thing, able to share on what did u do to make it better? #pleasehelp #firstmom #1stimemom the milk ive been giving so far is, similac, lactogen and NAN.