Children are divided into early childhood, preschool and school age, different stages of the nutritional needs of certain differences, so what to drink milk need to be analyzed on a case-by-case basis. 1. Early childhood: from the age of 1 to 3 years old before the early childhood, this stage of the digestive system is still not perfect, the nutritional requirements are still relatively high, and coincidentally in the weaning and lactation stage of food addition. Therefore, at this time the milk should be easy to digest light milk, so as not to produce indigestion. 2. Pre-school period: from the age of 3 to 6~7 years old before entering elementary school for the pre-school period, at this time the physical growth and development is in a steady state of growth, can be given enough calcium to meet the children’s bone development during this period of time, this period of milk can be high-calcium milk-based. 3. School age: from the beginning of elementary school (6~7 years old) to puberty is the school age, except for the reproductive system, the shape of all systems and organs are close to adult. Therefore, milk from safe sources is suitable for use during this period. However, it should be noted that children who are lactose intolerant and allergic to milk proteins need to be cautious about consuming milk.