A.H.
My son started on the Similac w/ iron in the hospital, but after three weeks became fussy and gassy. My dr suggested Enfamil's Gentlease. It worked very well even though it was expensive. I was hesitant to try anything else because it appeared we had solved his problem. However, the dr said that all formulas are standard to meet FDA approval so we tried Wal-mart's Parent's Choice Gentle. It worked just as well and is nearly half the price! For the Gentlease I paid $25 per can and PC costs only $15. This brand makes all of the different kinds, so you might find a version of the Alimentum too.
A.