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The first 1,000 days of the human microbiome starting from time of conception until 2 years old is a critical time period for growth and development, including nutrients and microbiota. Proper nutrition is an essential to support healthy life; lack of nutrition may have a lifelong negative impact to the child's development. [ 3 ]
Gestational age: 3 weeks and 0 days until 3 weeks and 6 days old. 22–28 days from last menstruation. Embryonic age: Week nr 2. 1 week old. 8–14 days from fertilization.
High levels of prolactin during pregnancy and breastfeeding also increase insulin resistance, increase growth factor levels (IGF-1) and modify lipid metabolism in preparation for breastfeeding. During lactation, prolactin is the main factor maintaining tight junctions of the ductal epithelium and regulating milk production through osmotic balance.
Breast crawl is the instinctive movement of a newborn mammal toward the nipple of its mother for the purpose of latching on to initiate breastfeeding. [1] In humans, if the newborn is laid on its mother's abdomen, movements commence at 12 to 44 minutes after birth, with spontaneous suckling being achieved roughly 27 to 71 minutes after birth.
The term "conception" refers variably to either fertilization or to formation of the conceptus after its implantation in the uterus, and this terminology is controversial. The zygote will develop into a male if the egg is fertilized by a sperm that carries a Y chromosome , or a female if the sperm carries an X chromosome . [ 5 ]
Exclusive breastfeeding usually delays the return of fertility through lactational amenorrhea, [211] [212] although it does not provide reliable birth control. Breastfeeding may delay the return to fertility for some women by suppressing ovulation. Mothers may not ovulate, or have regular periods, during the entire lactation period. The non ...
Human embryonic development or human embryogenesis is the development and formation of the human embryo.It is characterised by the processes of cell division and cellular differentiation of the embryo that occurs during the early stages of development.
Pre-conception counseling is care that is provided to a woman or couple to discuss conception, pregnancy, current health issues and recommendations for the period before pregnancy. [87] Prenatal medical care is the medical and nursing care recommended for women during pregnancy, time intervals and exact goals of each visit differ by country. [88]