Hi Doc My Daughter Is 3 Months Old, From 19th

Hi doc my daughter is 3 months old, from 19th aug I need to join my office. So my ped suggested to start nan pro from 1 spoon but my daughter vomitted a lot.. even I tried lactogen but still she vomitted. Is using zerolac will solve the issue? Even I tried cows milk but still she vomitted thrice. Please suggest I am getting tensed since I need to start and make her familiar with formula milkbefore I join my office.