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The fetus is considered full-term at the end of the 39th week of gestational age. It may be 48 to 53 cm (19 to 21 in) in length. The lanugo is gone except on the upper arms and shoulders. Fingernails extend beyond fingertips. Small breast buds are present on both sexes. Head hair is now coarse and thickest.
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 ]
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 ]
Breast development, also known as mammogenesis, is a complex biological process in primates that takes place throughout a female's life.. It occurs across several phases, including prenatal development, puberty, and pregnancy.
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.
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 continuing of breastfeeding, while introducing solids after 6 months, to 12 months were shown to have an efficiency rate of 92.6 – 96.3 percent in pregnancy prevention. [13] Because of this some women find that breastfeeding interferes with fertility even after ovulation has resumed. The Seven Standards: Phase 1 of Ecological Breastfeeding
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.
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