G.B.
Put that baby in a bouncy seat and strap them in. This elevates the baby, it sits much like an infant carrier car seat. They can't roll around so it won't last more than to ages 5-6 months but it will make all the difference in his tummy.
We gave my grandson Reglan before each and every bottle. It relaxes the lower tummy muscles so the tummy empties more and earlier. The formula goes on through the tummy sooner.
We also added Mylicon Gas Drops to each bottle before adding the water. Then we kept the water/med mix in the fridge in the bottles. We added the formula powder as needed. We did not shake it up, we gently swirled the powder until it was mixed. The shaking adds tons of air in the bottle.