Expectant mothers who experience a high level of stress and have little support are at greater risk of giving birth early.
That is according to a new study.
Researchers at the University of Colorado found stress increases certain proteins in a pregnant woman's body, which can contribute to preeclampsia and preterm labor.
Preeclampsia causes high blood pressure, headaches and affects the mother's kidney, liver and brain function.
If not treated, the mother could have seizures or even fall into a coma.
Premature infants can suffer from health problems due to a underdeveloped nervous system and lungs.