heartburn in infant?

my grandaughter is 5 1/2 mo. and has a severe problem with spitting up/vomiting her bottle, she also has hiccups off and on daily, especially if laid down to change diaper, etc.  She has now started a cough that is causing me concern becuase it seems to be associated with the vomiting somehow.  When my daughter was pregnant the baby had the hiccups in the womb every day during the last 3 or 4 months of pregnancy also.  I am concerned because after not seeing the baby for a week, I can see that she has gotten a lot worse in the last week and also looks pale.  The pediatrician gave her Prevacid SoluTab 15mg. and changed her formula from dairy/whey based to SOY.  
Any assistance anyone can give us will be deeply appreciated.  I am very concerned for the baby.  She has lost a few pounds.  I am afraid there is something else going on?
thank you.

[Renee Radenberg]

Children can develop issues with acid reflux, if that is what she has from your question. A few suggestions with acid reflux. The position of feeding is a sitting up position. Never lay the baby on their back right after eating because the acid from the stomach goes into the esophagus and causes pain. Raise the head of their crib to a 45-degree angle too so they is not flat on their back. Feeding them 5-6 times day help. Feeding that way keeps the stomach acid constant which helps the reflux, they grows, and their weight increases at a steady pace.