hai i have a 4 month old baby.. he was breast fed for 3 months and as i dnt lactate much now i have started to give him lactogen for past one month.. now he doesnt drink the milk properly... earlier he was drinking 3 oz now it has been reduced to 2 0z. he vomits watever he drinks at some times. what shall i do.....? can i introduce solid food.... or is there any means to make him drink the infant milk...?