Spit up in 4 month old

Shanay

My baby spits up about 15-20 times a day, is that normal? I’ve complained to my doctor countless times about it, and they act like I’m overreacting and told me I feed her too much. I feed her 5.5 oz every 3 hours, and she has just doubled her birth weight at 11 lbs. is this normal??? I’ve switched formulas as well to Enfamil AR, which hasn’t helped much.