The endocrine reproductive system becomes functional by the end of the first trimester of fetal life. Journal of Pineal Research. If pregnancy does not happen, the breasts go back to normal size. Male Female. Please note:
The ability to produce milk also comes about as a result of the influence of oestrogen.
Email an article
The foreskin then gradually becomes retractable. See also: This will include looking at the skin, listening to the heart and lungs, examining the back for any curvature of the spineand checking for the signs of puberty. Boys grow in size and strength, and their social and emotional life changes too. HealthEngine helps you find the practitioner you need.