My son is 5 month old and I start formula feed because i want t start my job but when I give her formula that I start from 30 mL he vomit and not take properly what I can do

A. You are introducing it for the first time and sometimes kids don’t like the taste of the milk that you are giving that’s why you have to keep trying slowly and steadily the child is going to accept it and the vomiting will automatically reduce