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.
Teenage Acne in Boys. During puberty, a boy's skin on his face, neck, back and chest will eventually begin to overproduce a type of oil called sebum.Sebum is normally a good substance -- it keeps the skin waterproof and fends off harmful bacteria.But too much is definitely not a good thing.eenage Acne in Boys. During puberty, a boy's skin on his face, neck, back and chest will eventually begin to overproduce a type of oil called sebum.