A recent study shows that the timing between pregnancies matters.
Researchers looked at the birth records of more than 400,000 babies and found that women who got pregnant less than a year and a half after their first pregnancy were more likely to deliver early. Half of the women who waited less than a year delivered prematurely.
According to the Centers for Disease Control and Prevention, one in every eight babies born in the U.S. is born before 37 weeks of pregnancy.
An ideal pregnancy lasts 40 weeks - enough time for organs like the brain, lungs and liver to finish developing. This is why premature birth is the leading cause of long-term neurological disabilities in children.
The study was led by Dr. Emily DeFranco and published in the International Journal of Obstetrics and Gynaecology.