Losec mups are very hard to give to a baby, and hardly ever work correctly for this reason. Most people don’t know how to give them either- can’t crush, dissolved and given into a bit of applesauce on an empty stomach and followed up by a meal 30-60 minutes later (that’s what we were told) is hard to do for a young baby. The zoton fastabs will taste better and may work better as they’ll be easier to give- still need to be given on an empty stomach and followed up with a meal 30-60 minutes later. This is just my opinion though, all babies are different. Mine hated the losec as she felt it tasted bad and I had an impossible time giving it. We personally did better on prevacid. The other issue sometimes is that the dose is too low. Good luck.