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Information linked to the menstrual cycle days
The menstrual cycle data (i.e. the first day of the last menstrual cycle) and the cycle length (period) can offer useful information into the female’s reproductive health and pregnancy planning.
The menstrual cycle consists in a follicular phase, ovulation and a luteal phase.
The fertile window depends on egg and sperm viability and can range a few days before and after the ovulation, hence why it is during one of these days that conception (in case a pregnancy occurs) is considered to have taken place.
The estimated due date prediction is also linked to conception (approximately 266 days after conception) for a birth at 40 weeks.
Please note the statistics, however, as 50% of all women giving birth for the first time gave birth by 40 weeks and 5 days, while 75% gave birth by 41 weeks and 2 days. Meanwhile, 50% of all women who had given birth at least once before gave birth by 40 weeks and 3 days, while 75% gave birth by 41 weeks.
Also see below the percentage of babies born at each of the following weeks:
| Week | Percentage |
| 35 | 1.4% |
| 36 | 2.7% |
| 37 | 6.3% |
| 38 | 13.4% |
| 39 | 26.4% |
| 40 | 31.6% |
| 41 | 16.2% |
| 42 | 2% |
| 43 | 0.1% |
These percentages are based on stats from a sample of 11,771 babies born spontaneously, excluding the 3,652 babies who were induced.
References
Beckmann CRB. (2010) Obstetrics and Gynecology. Lippincott Williams & Wilkins. pp. 306–307.
Abman SH. (2011) Fetal and neonatal physiology (4th ed.) Philadelphia: Elsevier/Saunders.
Specialty: Obstetrics Gynecology
System: Reproductive
Article By: Denise Nedea
Published On: April 14, 2020 · 12:00 AM
Last Checked: April 14, 2020
Next Review: April 14, 2025