Also, Doppler can detect abnormal blood flow within the heart, which can indicate a problem with one or more of the heart's four valves. Color Doppler. Color Doppler is an enhanced form of Doppler echocardiography. With color Doppler, different colors are used to designate the direction of blood flow.
Earlier Puberty: Age 9 or 10 for Average U.S. Boy. Oct. 20, 2012 -- American boys are starting puberty up to two years earlier than decades ago, new data show. Boys are entering puberty at an average age of 10 among whites and Hispanics, and at an average age of 9 among African-Americans. About a third of boys start to mature sexually up to two years earlier than average.
The emergence of body hair usually begins in the pubic area about the same time as breast development, usually starting at age 10 or 11 but sometimes not occurring until age 13 or 14. Underarm and leg hair appears a year to two later.In general the color, thickness, and pattern of body hair is quite variable.he emergence of body hair usually begins in the pubic area about the same time as breast development, usually starting at age 10 or 11 but sometimes not occurring until age 13 or 14. Underarm and leg hair appears a year to two later. In general the color, thickness, and pattern of body hair is quite variable.