baby is spitting up too much!

Hello! My LO is 9 weeks... she is active baby and she is exclusively formula fed. We use enfamil formula and she is doing great... but occasionally she spits up a lot but she doesn't seem to have any discomfort... but since 2 days her spit up is way more... like she spits up atleast 30-40% of what she eats... it's just laundry issue for now. She isn't fussy... pediatrician says it's fine... but I'm really worried... even enfamil gentle ease doesn't help much... anyone else on the same boat???? Please advice!