This drug is quite old.

You know we made liquid dilutions of this drug for newborn infants at the teaching hospital I once worked at. Before Zantac and Prilosec it was used for babies who spit up alot. Imagine what it did to their brains?

Babies born by C-section, do not get their fluids pushed out by delivery, which is nature's way.(babies swallow amniotic fluid) They get lavaged by a tube down the throat. This can injure the esophagus and hence that muscle allows for spitting up more commonly than in vaginally delivered babies. My son had this and it didn't correct until he was about 8 mos old. I lived with it, and didn't complain to doctors, because I knew he would be medicated, and I didn't want that.

Just as adults in our Westernized cultures commonly have GERD, babies can have it too. I personally think this reflects poor EFA status during the pregnancy which puts a huge load on the mother to provide DHA for the developing brain. The GI tract which also needs this critical EFA, then gets lower priority.
This situation may improve some, since there are several prenatals now with DHA added.

Here is a wiki article on it:
http://en.wikipedia.org/wiki/Metoclopramide