Due to the hormonal changes in a woman’s body during pregnancy, it may lead to the extrusion of clear water, mainly milk, from the nipples at 20 weeks of pregnancy. Due to changes in hormone levels in the female body during pregnancy, especially the secretion of hormones such as chorionic gonadotropin, estrogen, progesterone, placenta lactotropin and prolactin, it may cause pregnant women to have breast secretion of a small amount of transparent water at 20 weeks of pregnancy, and the general secretion is milk, which is a normal physiological phenomenon. If the phenomenon of milk secretion by squeezing the nipple at 20 weeks of pregnancy occurs, it is recommended that pregnant women use hot towels to apply hot compresses to the breasts, which can be locally wiped, and avoid squeezing the breasts to avoid inducing contractions. At the same time try to wear loose underwear, to prevent wearing too tight affect the development of the breast. If you have any discomfort during pregnancy, it is recommended that you seek medical advice in a timely manner, complete the relevant examinations under the guidance of the doctor, and clarify the cause of the illness.