If the mother does not take medication during the weaning period and then feeds the child after the weaning has failed, it will not usually affect the child. However, if medication is taken, the medication may affect the child through the breast milk. Mothers who fail to wean and then feed their children, if the mother is regular during the weaning period and did not take any medication, generally will not have an effect on the child. However, if the mother has taken medication during the weaning period, the medication may be secreted through the breast milk and enter the child’s body with the milk during the child’s breastfeeding process, which may affect the child to some extent. If a mother needs to use medication during weaning, she should use it under the guidance of her doctor. It is important to grasp the correct timing and wean gradually. In the process of weaning, pay attention to supplementing with formula milk and adding complementary food at the right time to avoid affecting the growth and development of the child due to weaning.