Drug use is another important aspect of a woman's health during pregnancy. Some prescription drugs can also be a problem during pregnancy, so discuss this with your doctor as soon as you know you are pregnant. Drugs can be harmful to a developing foetus throughout the pregnancy but the first three months is considered the time of most risk because the major organs and limbs of the baby are forming. How often the drug is used and the dose taken. Whether one or more drugs are used.
Some drugs have a cumulative or combined action which is more likely to be harmful for the baby.
Each baby, for reasons that are not clear, seems to have its own response to different drugs. Mothers can use the same drugs in the same amount for the same duration or length of a pregnancy, and the babies can react differently. There appears to be something in each individual baby which allows this to occur. No one can predict how a baby will be affected. A much lower risk of obstetric complications occurs in women who attend ante-natal visits early in the pregnancy and continue to attend throughout the pregnancy.