baby milk amount

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Updated on May 10, 2016
hi, i am a mother of 3mnths twins. both are on bf and ff as well. Mostly they bf only when i feel bf is insufficient for them from their gestures i ff them. Mostly 2-3 times a day only. But i find that they drink very less than mentioned on the feed table. Acc. to it they must have 180ml but while one of the twin drinks only 90ml and the other drinks 60ml only. Is it OK? They were born 20 days before due date.
