https://www.marchofdimes.org/find-support/topics/birth/preterm-labor-and-preterm-birth-are-you-risk
Preterm labor and preterm birth: Are you at risk? | March of Dimes
Preterm labor happens before 37 weeks. Are you at risk? Learn about the symptoms, risk factors and ways to reduce your risk for going into preterm labor.
preterm labor and birthare youat risk
https://web.archive.org/all/20040413034808/http:/www.marchofdimes.com/pnhec/159_1080.asp
During Your Pregnancy: Preterm Labor and Birth: A Serious Pregnancy Complication
Preterm birth occurs in about 1 in 8 pregnancies in the U.S, often for reasons we just don't understand. Babies born before 37 weeks of pregnancy are...
preterm labor and birthduring your pregnancyseriouscomplication