Breastmilk is very light like water, it may be colostrum, or it may be due to the low fat content of the milk, the mother drink too much water and so on. 1. colostrum: the milk secreted within a week after delivery is colostrum, usually colostrum is light in color or like water, this is a normal phenomenon, with time colostrum color will change. 2. milk fat content is small: may be maternal malnutrition caused by the milk fat content is small, it will look lighter, like water, the mother can increase nutrition, eat more protein, fat-rich foods will change the color of the milk. 3. Maternity drink too much water: Maternity drink too much water will lead to milk water content is large, be diluted, will also appear to look more light, like water. If the situation of breast milk being very light and watery-like persists without relief, timely medical treatment is needed.