I’m ready! What’s the delay?

1 min read November 13, 2024Week 42

Key takeaways

1 min

Understand that full-term pregnancy begins at 37 weeks, but labor typically starts within 10 days of your due date
Consider how your menstrual cycle length may naturally extend your healthy pregnancy timeline beyond 40 weeks
Know that maternal age and pre-pregnancy BMI can influence pregnancy duration and labor onset timing
Remember that healthy pregnancies can naturally vary by up to five weeks without cause for concern
Track your individual factors rather than comparing your timeline to standard pregnancy expectations

A healthy pregnancy typically lasts 40 weeks, but can naturally vary by up to five weeks. Most women go into labor within 10 days before or after their due date, with factors like menstrual cycle length, maternal age, and BMI affecting timing.

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I’m ready! What’s the delay?

37 weeks and one day is considered full-term, yet studies have found that more often labor begins within 10 days before or 10 days after the due date [1]. No one knows what causes a woman to start labor.

Factors that may affect your due date

The duration of your menstrual cycle. If your normal cycle is longer than the typical 28 days, you may have a longer pregnancy by the number of days your period exceeds the 28 days.
The embryo may have taken longer to attach to the uterus, but this is impossible to detect.
Mama’s age. Older mothers may have longer pregnancies.
Excess weight. In women whose BMI was above normal before pregnancy, pregnancy can last longer than those whose BMI was normal [2].

Frequently asked questions

A healthy pregnancy can naturally vary by up to five weeks from the estimated due date. Most women go into labor within 10 days before or after their due date, which is completely normal.

Your menstrual cycle length, age, and pre-pregnancy BMI can all influence pregnancy duration. Women with longer cycles, older mothers, and those with higher BMIs may have slightly longer pregnancies.

A healthy pregnancy is considered full-term starting at 37 weeks and 1 day. However, babies born anywhere from 37 to 42 weeks are considered full-term and healthy.

Going past 40 weeks is common and usually not concerning in a healthy pregnancy. Your healthcare provider will monitor you closely and discuss options if you reach 41-42 weeks.

Medical experts don't know exactly what triggers labor to begin. It's likely a combination of hormonal changes from both mother and baby that initiates the labor process naturally.

Medical Disclaimer

This article is for informational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or qualified health provider with any questions you may have regarding a medical condition.

Meet our medical experts

Medically reviewed content

Reviewed by healthcare professionals · Updated November 13, 2024

This article is based on peer-reviewed research and trusted medical sources.

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