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Shortly after fertilization, cellular development begins. Before implantation in the mother’s uterus, the sex of the new human being can be determined.
At implantation (5-9 days after conception) the new life is composed of about 100 cells and has developed a protective hormone to prevent the mother’s body from rejecting it as foreign tissue.
At 17 days, the tiny human has developed his or her own blood cells; the placenta is a part of the new life and not of the mother.
At 18 days, occasional pulsations of a specific muscle occur — this will become the baby’s heart.
At 19 days, the eyes start to develop.
At 20 days, the foundation of the entire nervous system has been laid.
By 24 days, the heart has regular beats or pulsations.
At 28 days, 40 pairs of muscles are developed along the trunk of the new life; arms and legs are forming.
At 30 days, regular blood flow exists within the vascular system; the ears and nasal passages have begun to develop.
At 40 days, the heart energy output is reported to be almost 20 percent of that of an adult.
At 42 days, the skeleton is complete and reflexes are present.
At 43 days, electrical brain wave patterns can be recorded. This is considered ample evidence that "thinking" is taking place in the brain.
At 49 days (seven weeks), the baby has the appearance of a small infant, with complete fingers, toes and ears.
At 56 days (eight weeks), all organs are functioning — stomach, liver, kidney, brain — and all systems are intact. Lines appear in palms. All future development of the new life is simply that of refinement and increase in size until maturity at approximately 23 years.
In the 9th and 10th weeks, the baby squints, swallows and retracts his/her tongue.
In the 11th and 12th weeks, the arms and legs move, the baby sucks his/her thumb, inhales and exhales amniotic fluid, and nails appear.
At 16 weeks (four months), genital organs are clearly differentiated; the baby grasps with hands, swims, kicks and turns somersaults. The mother may begin to feel her baby’s movements.
At 18 weeks the vocal cords are working — unborn baby can cry.
At 20 weeks (five months) hair appears on the head. The baby weighs one pound and measures 12 inches.
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