Nursing bottles are of three types: 120ml, 200ml and 240ml. You can choose the one suitable for you, but the bottle corresponding to the nursing amount for one time is recommended. They are made of glass or plastic. A glass bottle can be kept clean easily, but can sometimes break. It is heavy and, therefore, good for nursing at home. A plastic bottle rarely breaks and it light. Therefore, it is convenient to use when a baby begins to suck by himself or on an outing. However, it is easily scratched and dirtied. It is convenient to properly use 3-4 glass bottles and 2-3 plastic bottles.