u/1d-4-ever

My 3 month old just started on Similac Alimentum 3 days ago due to CMPA. We noticed an improvement immediately with spitting up but today he’s been spitting up more and has choked/coughed on his spit up a couple of times. We’ve been giving both the powder and ready to feed versions. Wondering if this is normal and how long it can take to fully get rid of symptoms? Any advice or experience is appreciated!!