Penicillin is an antibiotic, a class A drug, which has been clinically proven to have no effect on the fetus and will not cause abnormal fetal development or cause fetal malformation, and is relatively safe. If a pregnant woman has an inflammatory infection and needs to use penicillin, she must first do a penicillin skin test and only use it if she is not allergic to penicillin. If you are allergic to penicillin, it is strictly forbidden to use it. If an allergy occurs, the life of the pregnant woman can be affected at any time. Penicillin can treat bacterial infections. If an infection occurs in a pregnant woman and requires medication, it must be administered in accordance with the dose and the course of treatment. If penicillin is used in excessive doses for a long time, it is easy to develop drug resistance and cause disorders of the flora, which in serious cases can easily lead to invasion of sensitive bacteria into the organism. The use of medication during pregnancy must be under the guidance of a doctor, especially in the first 3 months of pregnancy, which is a critical period for the growth and development of the fetus, and any adverse stimulation can affect the growth and development of the fetus.