my baby is now 4 months and he now weighs 4.650grams only..last month he just gained 250 grams so I thought of switching from only breast milk to formula+ breast milk but my baby is just drinking 50 ml of formula milk only...and sleeps for 3 hrs.Iam giving him Nan pro1 and in the packet it's written only from 90 ml..I want to know how much scoop of Nan for 50 ml water and how many formula feeds of 50 ml should I give him in a day??