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Active and quiet periods for the fetus do not correspond to those of the mother; fetuses are most active from 9 a.m. to 2 p.m. and again from 7 p.m. to 4 a.m. [21] During the last four to six weeks before birth, most of the fetus's kicking and jabbing movements occur while it is sleeping lightly.
One of the most important types of memory is that which stores information contributing to the maternal bond between infant and mother. This form of memory is important for a type of development known as attachment. [2] Fetal memory is thus critical to the survival of the fetus both prenatally (in the womb) and after birth as an infant.
By 4 months, the average infant sleeps 14 hours a day (including naps), but this amount can vary considerably. [10] By 8 months, most infants continue to wake during the night, though a majority are able to fall back asleep without parental involvement. [2] At 9 months, only a third of infants sleep through the night without waking. [3]
Prenatal development (from Latin natalis 'relating to birth') involves the development of the embryo and of the fetus during a viviparous animal's gestation.Prenatal development starts with fertilization, in the germinal stage of embryonic development, and continues in fetal development until birth.
By the time the baby is learning to roll over, often around 4–5 months, parents and caregivers should transition the baby from swaddling to a less restrictive covering for sleep. If the baby can roll over, then it is important for the baby to have use of its hands and arms to adjust his or her head position after rolling over.
If one strikes a pregnant woman or gives her poison in order to procure an abortion, if the fetus is already formed or quickened, especially if it is quickened, he commits homicide. The fetal right to life post-quickening was recognized by the 18th century British legal scholar William Blackstone as a legally protected right "inherent by nature ...
[13] [quantify] Dr. Oluyinka Olutoye, alongside Darrell Cass, from the Texas Children's Fetal Centre, removed a 23-week-old fetus from her mother's womb in order to perform surgery upon a spinal tumor she had. The girl was placed back in the womb after a five-hour surgery and was born without complications. [14]
The gestation length for humans is 266 days, or eight days short of nine months, which is counted from the first day of the woman's last menstrual period. During gestation, mothers must support the metabolic cost of tissue growth, both of the fetus and the mother, as well as the ever-increasing metabolic rate of the growing fetus. [ 14 ]