Hello. My daughter is 15 weeks old and has been on Prevacid for 3 weeks. We were first given a trial prescription, which when filled was given to us in liquid form. We've since gotten a full prescription because it worked so well, but this time we were given the dissolvable tablets. 15 mg broken in half twice a day. About the time we started her on the tablets, she started spitting up again more frequently, along with bloating, foul smelling gas, and she's started fighting her feedings again. Her dirty diapers are still consistent, but they smell of diarrhea now.