One of my 8 months old twin son did not breastfeed from day one so I gave him prenan. Everything was ok till 1st month then suddenly one day he vomited. After 2 days he vomited again. I took him to his pediatrician who prescribed perinorm. But the chemist mistakenly gave me azithromycin. Which I gave him for 3 days x 3 times. My baby' s vomiting worsened after that. He started vomiting 4 - 5 times a day. And did not take his feed easily. As if he is never hungry. Till now he do not like to be fed and if fed anyhow, he vomits. It' s 7 months now but he has no relief from his vomits. His weight gain is about 200-250 gms per month.