Clear milk may be caused by foremilk, malnutrition, prolonged breastfeeding period, poor mood and other reasons. 1. foremilk: breast milk becomes clear may be foremilk, foremilk contains more water, milk will become clearer, after the middle milk contains more fat, manifested as viscous milky white-like. 2. Malnutrition: excessive dieting or picky eating during breastfeeding, usually a light diet, daily intake of protein and fat and other nutrients are insufficient, will affect the quality of breast milk, resulting in clear milk. 3. Long breastfeeding period: If a woman breastfeeds for too long, the nutrients in her milk will gradually decrease, which will also lead to clear milk. 4. Poor mood: If a woman is in a long time in boredom, sadness, crying and other emotions, long-term poor mood may affect the quality of milk, resulting in clear milk. There are a lot of reasons why a person’s milk may become clear, and it is advisable to go to the hospital in time to have it checked if there is any abnormality in the milk.