Lifestyle can affect pregnant women. It has to do with their food intake, alcohol intake, whether they smoke, how regularly they exercise, etc. They should always take precaution in order to avoid any adverse effect of lifestyle.

Diet
Women who diet extremely or who have had eating disorders like bulimia or anorexia could be risking a low-birth-weight infant who is more susceptible to illness. Appropriate diet modification many months before conceiving can lower that risk.

Smoking
Smoking in women is associated with higher rates of miscarriage, lower infant birth weight, sudden infant death syndrome, and infant respiratory illnesses.

Alcohol
Alcohol intake can affect child development. Foetal Alcohol Syndrome is now recognised as a cause of serious birth defects, particularly mental underdevelopment. The lowest amount of alcohol that causes defects are unknown, so women are advised to abstain from alcohol during pregnancy and even before.

Exercise
Exercise can be helpful in increasing lower back and abdominal strength. Both areas can cause discomfort throughout pregnancy. Exercise can also improve labour outcome and help maintain well-being.