Baby keep spitting milk

Hi mummies, my baby is on full formula, past few days she keep spitting milk frequently after feed. Sometimes abit sometimes quite alot. Is it normal? Is it because of overfeed? Or need to burp more? Sometimes even after burping also same thing. But the she never puke out like fountain She started off with 30ml when in hospital and now 11 days old we try to increase gradually till now 50ml per feed. Or is it too much for newborn? Cause as per paediatrician, according to his weight, he may consume 60ml.