A woman who is pregnant while breastfeeding will have milk, but it will appear to decrease significantly. The hormones in a woman’s body after pregnancy are mainly progesterone and estrogen, and the values of both hormones rise rapidly and the value of lactogen in the body decreases. It is recommended to wean the breastfeeding child in time because the fetus needs sufficient nutrition to maintain normal growth and development after pregnancy, which will also affect the nutrients in the breast milk and affect the growth and development of the breastfeeding baby, resulting in anemia or calcium deficiency in severe cases. In addition, a series of early pregnancy reactions will occur after pregnancy, such as drowsiness, fatigue, nausea, vomiting, loss of appetite, etc. As the pregnancy months increase, milk will gradually decrease, or even no milk secretion will occur. It is recommended that women conceive after the breastfeeding period to avoid the impact on the fetus and the nursing child.