In general, breastmilk thin can be adjusted through diet, to a large extent, can make breastmilk thickening, if necessary, it is recommended to consult a doctor in a timely manner, to clarify the cause of the disease and then timely diagnosis and treatment. Breast milk exists a process of change, usually within 7 days after delivery of the milk is generally thicker, breast milk becomes thin is usually due to insufficient nutrition, should strengthen the nutrition, adjust the diet, it is recommended to eat more fresh fruits and vegetables, moderate amount of sea fish, butter, nuts, pig’s trotters, the daily diet can be more crucian carp soup, more stewed pig’s trotters and other food, supplement the body protein and other nutrients in order to improve the quality of breast milk. Maternal milk dilution may have an impact on the physical development of the fetus, in addition to dietary modification, it is recommended to go to the hospital to check the blood routine, trace elements, etc., to see whether there is malnutrition, if abnormal, to carry out the cause of the treatment.