My 14 week old breast fed bg has suddenly started vomiting up every feed, last weigh in she'd gained nothing in a week (now 10lbs 8 ozs but v.tall) Giving Infant Gaviscon after every feed but although vomiting not so severe now vomit all jelly-like and revolting. Plus no poo for three days since I started giving it to her she used to fill her nappy at least twice a day before. Getting worried although she seems happy, sleeping through the night etc. Seems to be better if I keep her horizontal and don't burb her at all - can't be right, surely? How long without a poo before she explodes please?