Possible reasons may be either with the baby itself or the mother. In the former case, it is perhaps because the baby was born very small or handicapped, or the baby’s mouth muscles are too weak to suck well. If this is the case, the cause must be checked by a doctor and appropriate corrective action must be taken. Therefore this is not the case about which a mother can be worried. In the latter case, the cause is often the mother’s breast: a flat breast, an inverted nipple, etc. It is said that more and more women have inverted nipples probably because they started wearing a bra at a tender age of 10 years old or ocassionally wearing their bra to sleep. They use a tight bra which may help form large breasts but with flat tops. A nipple of such breasts is often inverted and hardly caught by the baby’s tiny mouth. In this case, perhaps a breast shield is useful when giving breast milk. Sometimes a baby cannot suck well because the breast is full of milk. In this case, before nursing, squeeze a small amount of milk with the hand, or warm and soften the nipple with a hot wet towel, which will help milk to come out. If you use a breast shield, it is recommended to warm the nipple well with a hot wet towel before using. Some mothers breast-feed well by putting some breast milk into a breast shield with the hand before letting the baby suck the nipple.