During middle childhood, medical conditions are common and medical conditions are rare.

During middle childhood, acute medical conditions are common and chronic medical conditions are rare.

Middle childhood is the period of time in which a child is learning basic skills and this period can bring many changes to life. It is the period of time from age 6 to 12.

Acute medical condition refers to a normal, small sudden damage, like cut. But chronic medical condition is severe and long term.

the corpus luteum secretes estrogens and progesterone. the latter hormone causes changes in the uterus that make it more suitable for implantation of the fertilized ovum and the nourishment of the embryo. if the egg is not fertilized, the corpus luteum becomes inactive after 10–14 days, and menstruation occurs.

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