This is because cigarette smoke inhaled by the mother, either from her own or someone else's cigarette, reduces the amount of food and oxygen getting to the fetus. Underweight babies are at higher risk of health problems. A healthy weight and a nutritious diet contribute to the well-being of both the parents and the baby. An underweight or malnourished mother is at increased risk of having a premature or underweight baby, with other associated risks. Certain maternal infections can cause harm to the fetus.
Some drugs can affect the fetus.
Some natural remedies and herbal teas have drug-like properties and can also have an effect on the developing baby. Illegal drugs can present great danger. Fish caught in certain lakes or rivers may have levels of contaminants that make them unsuitable for consumption by pregnant women. The father's lifestyle also has an impact on the success of a pregnancy. For example, exposure to certain chemicals, gases or drugs can cause damage to the sperm, resulting in infertility, birth defects or miscarriage.