hello mam or sir, my baby is 18 month old and from 1 week morning or night while giving milk and roti he do vomate and in whole day while feeding just h me do vomate sound but either morning or else night he do vomate pls tell me what to do and potty he was doing 3 time in a day but now a days he do only once or twice,pls advice me why this is happening and what to do