in my first two weeks of delivery, I use to give only breast milk for my baby, but baby weight not increased, in the third week doc advised to give similac post my breast milk if it's not sufficient. baby started putting weight within one milk from 2.56 to 3.080 kg now. Is my breast milk not sufficient or how many ml will baby drink he is not 29days now.. shall I continue to give similac along with my breast milk?