Primary sex characteristics are those present at birth. Secondary sex characteristics are those that appear during puberty. “Since 1850, the typical age of onset of menarche [periods] in young girls has dropped from 16 to about 12.5 years of age. Several guidelines now set the onset of secondary sexual changes in girls at age 8 (with menarche as early as age 10) and the onset of secondary sexual changes in boys at age 9 years. (From the site Healio). HELLO! We’re talking breasts and balls here – at ages 8 and 9!?!
Dr Josh Axe on Endocrine Disruptors. Excerpts: What Makes Up Your Endocrine System? The endocrine system, made up of all the body’s different hormones, regulates all biological processes in the body from conception through adulthood and into old age. This includes the: development of the brain and nervous system growth and function of the reproductive system function of metabolism and blood sugar levels Major components of the endocrine system include: female ovaries male testes pituitary gland thyroid gland adrenal glands Other components include the: pineal gland thymus hypothalamus parathyroid glands pancreas