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Linear growth is a complex process regulated by the growth hormone (GH) – insulin-like growth factor-1 axis, the thyroxine/triiodothyronine axis, androgens, estrogens, vitamin D, glucocorticoids and possibly leptin. [25] GH is secreted by the anterior pituitary gland in response to hypothalamic, pituitary and circulating factors.
In biological terms, the development of the human body entails growth from a one-celled zygote to an adult human being. Fertilization occurs when the sperm cell successfully enters and fuses with an egg cell (ovum). The genetic material of the sperm and egg then combine to form the single cell zygote and the germinal stage of development commences.
The term Advanced maternal age is used to describe women who are over 35 during pregnancy. [ 29 ] [ 30 ] Women who give birth over the age of 35 are more likely to experience complications ranging from preterm birth [ 30 ] [ 29 ] [ 31 ] and delivery by Caesarean section , [ 30 ] [ 31 ] to an increased risk of giving birth to a child with ...
According to a study conducted by Whitcome, et al., lumbar lordosis can increase from an angle of 32 degrees at 0% fetal mass (i.e. non-pregnant women or very early in pregnancy) to 50 degrees at 100% fetal mass (very late in pregnancy). Postpartum, the angle of the lordosis declines and can reach the angle prior to pregnancy.
Universal use of ultrasound to screen nulliparous women in the third trimester roughly triples the detection of small for gestational age (SGA) infants; moreover, combining ultrasound measurements of the estimated weight and of the growth velocity of a fetus identified a subset of small babies at increased risk of neonatal morbidity. [9]
In the female, a deep groove forms around the phallus. The sides of it grow dorsalward as the labioscrotal folds, which ultimately form the labia majora in females. The labia minora, in contrast, arise by the continued growth of the lips of the groove on the under surface of the phallus; the remainder of the phallus forms the clitoral glans. [8]
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Fetal factors include the fetal genome, nutrient production, and hormone output. Also, female fetuses tend to weigh less than males, at full term. [18] Fetal growth is often classified as follows: small for gestational age (SGA), appropriate for gestational age (AGA), and large for gestational age (LGA). [19]
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