My 5 month old daughter only eats about 20 oz a day, last time she weighed ( 2weeks ago) 14.7 lbs, she has been diagnosed with acid reflux and is currently taking prevacid twice a day (15 mlg). Is only eating 20 oz OK or should I be concerned? Also, she tilts her head down consistently, she is able to hold it up but primarily holds it down and to the side, this is concerning to me.