I try to breastfeed my 2 months old baby regularly but due to lack of enough milk secretion, doctor advised to give formula milk partially. I have my co-sister at home who also breastfeed my baby when I go dry. This way, there was no necessity for formula. However, when my co-sister is out of home at rare occasions, I had to switch to formula once or twice a day. This happens once or twice a month. Pls advise if its OK to feed the baby with formula on and off