Understanding the Importance of Prenatal Care and Calculating Due Dates

February 1, 2024

1. First prenatal check-up: The first prenatal check-up for pregnant women includes inquiring about family history and personal medical history, measuring baseline blood pressure, weighing, listening to heart and lungs, gynecological examination, as well as urine and liver function tests.

2. Establishing a "Prenatal Health Card": After confirming pregnancy, pregnant women should immediately establish a "Prenatal Health Card" and safely go through the stages of pregnancy, childbirth, and postpartum under the guidance of a doctor.

3. Calculating the due date: Pregnancy usually lasts for more than 9 months. During this time, the embryo transforms from a simple cell into a highly complex organism composed of millions of cells. In the entire process of human life, there is no other time when growth occurs as rapidly as during this short period.

Once the pregnancy is confirmed, the expected date of childbirth can be estimated, which is medically known as the "due date." To calculate the due date, simply add 9 months and 1 week to the first day of the last menstrual period. For example, if the last menstrual period was on January 1st, adding 9 months would be October 1st, and then adding 1 week (7 days) would be October 8th. October 8th would be the due date.

Actual delivery may occur within 2 weeks before or after the due date. For women with a menstrual cycle every 3 weeks, the pregnancy duration should be 280 days minus 1 week, which is 39 weeks. For women with a menstrual cycle every 4 weeks, the pregnancy duration should be 280 days, which is 40 weeks. For women with a menstrual cycle every 5 weeks, the pregnancy duration should be 280 days plus 1 week, which is 41 weeks.

If your menstrual cycle is irregular or if you cannot remember the date of your last menstrual period, you should calculate based on gynecological examination in early pregnancy.

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