My new born not gaining much weight, doctor asked to give top feed, after top feed 2 times a day 90 ml, weight gain is around 20 gms per day, now doctor has asked to give 60 ml after each breast feed. She has vomited twice after doing so. She is 3.3 kg after one month, birth weight was 3.125. Baby is active and has no other issues apart from weight gain. Should we give so much top feed? Is it safe for baby?