Baby Lying Sideways (Transverse Lie)
The short answer
A transverse lie means the baby is lying sideways (horizontally) across the uterus rather than vertically. This is common earlier in pregnancy but occurs in less than 1% of pregnancies at term. If the baby remains transverse near your due date, your provider will discuss options including external cephalic version (ECV) or planned cesarean delivery, as vaginal birth is not possible in this position.
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By Age
What to expect by age
Babies frequently change position throughout the second trimester, and a transverse lie at this stage is not a concern. There is still plenty of time and room for the baby to settle into a head-down position.
If the baby is transverse after 36 weeks, your provider will evaluate the situation. Factors like placenta position, uterine shape, amniotic fluid volume, and multiple pregnancies can contribute. ECV may be attempted to rotate the baby. If the baby cannot be turned, a cesarean delivery will be planned, typically at 39 weeks.
What Should You Do?
When to take action
- Transverse lie before 36 weeks is very common and usually self-corrects
- Feeling the baby move into different positions throughout the day
- Baby appears to be transverse after 34-36 weeks
- You have had a previous transverse lie and wonder if it will recur
- You want to discuss options for encouraging the baby to turn
- Water breaks with a transverse lie - go to the hospital immediately (high risk of cord prolapse)
- Contractions begin with a known transverse lie
- Sudden abdominal pain with a known transverse lie
Sources
Related Resources
Trust your instincts. If something feels wrong, reach out to your pediatrician.
Worrying about your baby means you care. That is a good thing.
Related Maternal Concerns
Baby in Breech Position
A breech presentation means the baby is positioned bottom-first or feet-first rather than head-down. About 3-4% of babies are breech at full term. Many babies turn head-down on their own before 36-37 weeks. If the baby remains breech, options include external cephalic version (ECV) to turn the baby or a planned cesarean delivery.
When Birth Does Not Go as Planned
It is very common for birth to unfold differently than planned. About 1 in 3 births in the US involve cesarean delivery, and many other births involve unplanned interventions. Feeling disappointed, sad, or even grieving the birth experience you envisioned is completely valid. What matters most is that you and your baby are safe, but your feelings about the experience also matter.
Dealing with Abnormal Prenatal Screening Results
An abnormal prenatal screening result can be terrifying, but it is important to understand that screening tests are designed to cast a wide net and have significant false-positive rates. Most people with abnormal screening results go on to have healthy babies after further testing confirms the baby is fine. An abnormal screening is a reason for more information, not a diagnosis.
Pregnancy Over 35 (Advanced Maternal Age)
While pregnancy after 35 carries some increased risks (including chromosomal abnormalities, gestational diabetes, and hypertension), the vast majority of people over 35 have healthy pregnancies and healthy babies. The term "geriatric pregnancy" is outdated and does not reflect reality. With appropriate prenatal care and monitoring, outcomes are excellent.
Amniocentesis Questions and Fears
Amniocentesis is a diagnostic test performed between 15-20 weeks that analyzes amniotic fluid to detect chromosomal conditions and genetic disorders with over 99% accuracy. The risk of pregnancy loss from the procedure is approximately 1 in 500-1,000 when performed by an experienced provider. Understanding the actual risks can help you make an informed decision.
20-Week Anatomy Scan Unexpected Findings
The 20-week anatomy scan checks your baby's major organs, structures, and growth. Most scans are completely normal. When unexpected findings are identified, they range from minor variants that resolve on their own to conditions that need further evaluation. Many findings require nothing more than a follow-up ultrasound to confirm the baby is developing well.