My youngest is 4 months, I have a feeling she just doesn't like formula? She is 13 1/2 pounds and was born at 8 pounds. At her 4 month check up last week she is still eating 2-3 ounces every 3-4 hours which is under what she is "suppose" to be eating. When I feed her, she just stares off at the ceiling or fan, she use to stare at me but she doesn't anymore. After a couple ounces she just loses interest and I kind of have to just keep sticking the bottle in her mouth over and over again. I did get a prescription for zantac last week and I started giving that to her 2x a day ( she has had it for 4 days so far) it hasn't seemed to do much yet, I have noticed the coughing after burping stopped and she didn't get hiccups at all today. But her eating hasn't changed yet. Has anyone experienced anything like this? Am I doing something wrong? We've went through every bottle on the market, changed formulas about 10 times. I have started her on cereal 1x a day mixed with a veggie and she loves it.