The chances of survival for very premature babies has dramatically increased over the past 30 years, but preterm births are still hard to prevent. Women’s health expert Dr. Kirtly Parker Jones says nearly 1 in 10 babies in the U.S. will be born prematurely, and premature babies can also mean expensive medical costs. Learn what health conditions or interventions — such as in vitro fertilization — can lead to preterm births and how the risks of prematurity can be treated.