Sounds like your little one could have acid reflux. A simple medicine provided by your doctor could cure that...

Also, my niece was like the exorcist when spitting up as well. What I did was put rice cereal in her formula...not much...enough to make it thicker...
I fed her very little but a lot throughout the day. It seemed to be better on her tummy than feeding her x amount of ounces every 3 or so hours... It ended up being like an ounce about every hour...

yes it does sound like acid reflux, or it could be a severe case of wind. also, you shouldn't really be changing his milk so often. i think it would be best to get another doctors oppinion.

does he get rashes?
its possible he could be allergic to milk products?
or maybe try feeding him in very small portions more often?
also try dr. brown bottles

yes, dr browns products are great for colic! a bit on the pricy side but well worth it

We use nothing but Dr. Brown bottles. They are great!!! My little girl hardly ever spits up or has tummy aches. We have also been fortunate to not have had to deal with colic. I don't know if that has anything to do with the bottles or not.

Another thing you can try is putting a rolled-up towel under the crib mattress on one side to keep him slightly elevated, or put him to bed in his carseat. Keeping his head elevated above his tummy might help things stay down.

all I use is dr. brown bottles...they are the best.....I just wish I knew what to do

My son went through that too, actually occasionally he still does projectile spit up. I find that keeping him upright after a feeding helps a lot.

Changing formulas can also cause them to spit up, because it takes some times for their little tummies to adjust to the swap. Enfamil Gentlease is very good.