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.
Quick Answer. The age at which people grow armpit hair varies, but for boys it is often between the ages of nine and 14. Girls typically begin to grow this hair between eight and 13 years of age. Keep Learning.
Shaving is a big deal to many boys and they look forward to it, even if they have to wait a while for puberty to catch up with them. Most boys won't develop facial hair until they're well into puberty (generally around age 14 or so), while others may need to begin shaving in the later tween years. Either way, arm yourself with a few handy shaving tips to help your child learn to do it the right way.