«Twins are at higher risk of preterm labor and delivery and have higher degree of respiratory issues.» (webmd.com)
A Primer on the Signs of Preterm Labor Remember to contact your caregiver immediately if you experience any of these possible warning signs: (attachmentparenting.org)
Both rhythmic pain and severe back pain are sometimes symptoms of preterm labor, so consulting a doctor is important if a woman experiences rhythmic pain. (cozybump.com)