How many days does it take for the fertilized egg to combine?

It takes about a week for the fertilized egg to combine, but many people can complete the combination in about three days. The specific time of combination should be determined according to each person's different situation, and try to conceive at the best age, which will also make your baby healthier. After successful conception, you need to go to the hospital as soon as possible for relevant pregnancy tests.

1. Allowing the newly released egg to be fertilized immediately can avoid the external environment and maximize the chance of conceiving a child with good physique and high IQ.

2. The best childbearing age for Chinese women is 24-34 years old. Children born when the father is 30-40 years old and the mother is 24-29 years old are more likely to succeed.

3. The temperature in late summer and early autumn is suitable, avoiding the period of virus epidemics and disease outbreaks. There are rich foods that can enable pregnant women to obtain the most adequate nutrition and store it in the body to prevent nutritional loss caused by morning sickness in early pregnancy and benefit the early brain development of the fetus. The middle and late stages of pregnancy are in spring, and the pleasant environment is very conducive to prenatal education.

4. When conceiving, you should avoid these changes in the natural environment: solar magnetic storms, earthquakes, solar and lunar eclipses, and full-moon nights can all cause significant changes in people's emotions and reduce the quality of sperm and egg cells. Strong X-rays are produced when thunder and lightning strike, which can cause chromosomal abnormalities in germ cells. Solar flares occur during sunspot weeks, which can harm reproductive cells and embryos, leading to intellectual disabilities in babies after birth.

Fertilization occurs after the formation of the corpus luteum. The progesterone secreted by the corpus luteum prompts the fallopian tube epithelial cells to secrete nutrient fluid to nourish the fertilized egg and enable it to move. 24-36 hours after fertilization, the fertilized egg divides into two cells and continues to divide, moving as it divides. 72 hours after fertilization, it divides into a solid mass of 12-16 cells, called a morula.

Due to the contraction and relaxation of the fallopian tube smooth muscle and the beating of the mucosal epithelial cilia, the fertilized egg crosses the ampulla-isthmus junction. It passes through the isthmus, forms a morula, and enters the uterus. The fertilized egg undergoes cleavage in the fallopian tube but does not increase in size.

The morula absorbs nutrients from the uterine cavity, the uterine fluid seeps into the morula, the cells divide and proliferate, and about 96 hours after fertilization, it develops into a blastocyst. The composition of the blastocyst: ① The trophoblast is composed of the peripheral cell groups; ② The gap surrounded by the trophoblast contains liquid, which is called the blastocyst cavity; ③ The cell group located at one end of the blastocyst cavity is called the inner cell mass, which will later develop into the embryo. After entering the uterine cavity, the morula remains free for about 3-4 days.