The fact is, if you have a fever of 40 degrees, it is not advisable to breastfeed, because the possibility of infection is very high, and if you use medication, the medication may enter the child’s body through the breast milk, which is not conducive to the child’s growth and development. Fever of 40 degrees considering the possibility of acute infection, this time must pay attention to, timely consultation, can follow the doctor’s instructions appropriate use of some fever-reducing drugs such as acetaminophen tablets and other treatments, and at the same time, to improve the blood routine, blood cultures and so on to clarify the source of infection. In addition, drink plenty of lukewarm water and stop breastfeeding. When the mother has a fever, she can be given formula milk, but pay attention to the ratio of formula milk and water, and after the mother recovers, she can continue breastfeeding.