【正文】
Fetal Period from fertilized ovum to delivery (about 40 weeks) Feature easy abortion or malformation formed by any risk factor 年齡分期 新生兒期 Neonatal Period from umbilical ligation to 28th day Features Beginning living independently Lack the ability of physiological regulation and to adapt to circumstances Morbidity amp。 energy requirements are more digestive amp。 development bee the fastest neuroendocrine regulation is unsteady a lot of problems in spirit,emotion and behavior 年齡分期