her weight is 5.200 but she very active but a reflux baby

A. Namaste Mom , Weight you can check as per the birth weight which is monthly expected to gain in range of 400 gm to 1 kg and by age of 4 to 6 months they double their birth weight. For reflux, observe the quantity of the feed as should be as per how much the baby is able to take comfortably per feed, also the baby is helped to get a burp, and keep him in upright postion for some while