Whether oral medication in the first month of pregnancy will have an impact on the baby, you need to combine the specific types of drugs, time to take medication and so on to help determine. First, the type of drugs: 1, relatively safe drugs: such as vitamins, calcium, iron, etc., itself the baby in the process of growth and development also need, generally will not have a negative impact on the baby; 2, careful use of drugs: as the name suggests, need to be careful to choose the drug, such as bacterial infections during pregnancy, the need for anti-infective treatment, if not treated in a timely manner will affect the growth and development of the baby. In the case of the benefits outweigh the disadvantages, after excluding drug allergies can consider using penicillin or cephalosporin antibiotics, generally will not have an adverse effect on the baby, but also pay attention to regular obstetric examination, do a good job of malformation examination; 3, prohibited drugs: take to affect the growth and development of the baby, such as compound adamantadine aminophenazole tablets, adamantadine, aminophenazole and so on, can be passed through the placenta, the embryo has a toxicity and can be teratogenic, affecting the The baby’s growth and development. There are also some blood-activating drugs such as Daxuoluo Pills, which may lead to miscarriage after taking them. Second, the time to take drugs: 1, insensitive period: that is, the early embryo, 14-28 days after the last menstrual period, at this time the embryo is only simple cell division, has not yet been differentiated into tissues and organs, the impact of the drug on the embryo is “all or nothing”, the embryo is affected by the lethal dose of the drug and death, that is, there is a miscarriage, or the baby has not been affected by the drug, but also does not lead to abortion. Sensitive period: refers to the embryonic period, i.e. 29-70 days after the last menstrual period, this period belongs to the period of differentiation of the baby’s organs, such as the central nervous system (brain), the circulatory system (heart), the sensory system (eyes, ears), the musculoskeletal system (limbs), etc. At this time, the embryo is the most sensitive to the drug, which is the most sensitive to the drug. This is the time when the embryo is most sensitive to drugs and prone to serious malformations.