The first week of embryo development is the period of division (division) of the zygote into daughter cells. During the first 3-4 days the zygote is divided and simultaneously moves along the fallopian tube towards the uterine cavity. As a result of the division of the zygote, a multicellular vesicle is formed - a blastula with a cavity inside (from the Greek blastos - a sprout).
The formation of most hypothalamic hormones begins in the prenatal period, so all the hypothalamic nuclei differentiate to 14 weeks of pregnancy. By the 100th day of pregnancy, the portal system of the pituitary gland is being completed, and the hypothalamic-pituitary system completes the morphological development by the 19-21 week of pregnancy.
First, two cells are formed from one cell, then a transverse constriction appears, dividing these two cells into two more - there are four of them, then eight, sixteen, thirty-two, and so on.
Adolescence is a period beginning at about the age of 10 and continuing until the end of the senior school age or until age 21, during which children are exposed to significant physical, intellectual and emotional changes. Helping a child to go through this period is not an easy task for both parents and health professionals.
The fact of pregnancy or, more accurately, conception is the fusion of a sperm with a mature female egg
Every month the woman's organism lives according to the rhythms, determined by nature, all biological processes must take place in the given regime, preferably without failures and changes.
Each child has an individual rate of biological development, and his biological age may differ to a certain extent from the age of his peers on the birth certificate.
A child's sleep is a natural component of his physiological activity, ensuring a normal rhythm of the processes of higher nervous activity, metabolic processes, physical development, growth and maturation.
The health group of the newborn is evaluated at discharge from the maternity ward. I-st group - healthy children from healthy mothers, gestosis of 1 half of pregnancy.
The puerperal, or postpartum period is the period beginning after the birth of the afterbirth and lasting 8 weeks. During this time, reverse development (involution) of organs and systems, which underwent changes due to pregnancy and childbirth, occurs.