My baby 6 months old , from 3 mths she was taking Zerolac (cause she has lactose intolerance for timebeing), before that she was taken NAN & BF. But now I want to start NAN but can t, only she is taken BF & Zerolac.tried lactodex but vomit. Doctor told me to start lactogen, but i confused about her nutrition , cause she doesn t want drink NAN & vomit after drink lactodex. please advise.