Embryonic Period: 15th day - 8 weeks, most vulnerable to teratogens because of cell differentiation, nervous & cardiovascular systems present, eyes, ears, & primitive mouth exist, lung buds present, Fetal Period: 9th week - 40 weeks, longest period of prenatal development, all major organ systems present, movement can be detected by mother, vernix & lanugo form to protect skin, significant weight gain, viability is reached (24 weeks), Teratogens: alcohol, caffeine, cigarettes, illicit drugs, substances, organisms, deficiencies capable of inducing abnormal structure or function, FDA classifications A-D & X, prescription (Rx) & over-the counter drugs, Newborn Reflexes & Screening: moro, Babinski, palmar grasp, sucking, rooting, stepping, automated responses indicate healthy development of nervous system, automated responses should both be present & disappear at designated times during development, hearing, PKU, blood pressure, skin appearance, neonatal abstinence syndrome,

Prenatal Development

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