Dear Manoj,
I feel sorry that you are facing the problem of insufficient milk for baby . I would like to affirm here that God has has given every female milk glands that can produce milk enough to feed twins in each case. however, the production depends on how often and how much the breast is emptied each time the baby feeds. Once the baby is put on breast, let it suckle as long as it wants. When full, the baby will stop suckling and leave the breast of its own. The next time put on the other breast.
If the baby is not suckling, the breast will not be emptied and new milk will not form . if top milk is given, the baby will not be hungry, will not suckle, breast will not be emptied and new milk will not form.