Call your doctor if your baby: 1  Is under 3 months old and has a temperature over 100.4 F. 2  Is over 3 months old and has a fever over 102 F. 3  Has a fever that lasts longer than 24 hours.  Has diarrhea, vomiting, or a rash with the 1  fever. Is very sleepy or looks sick.  Can't be soothed.
There is two main pigments found in human hair: Eumelanin has an oval or elliptical shape, which gives color to brown or black hair and is dark pigment. The higher the concentration of Eumelanin the darker the hair. Pheomelanin is what produces the color in blonde or red hair.
The Graying Process. With age, the pigment cells in a hair follicle gradually die off. As they do, that strand of hair will no longer grow in with as much color and will show up as more silver, gray or white as it continues to grow.Eventually, if all the pigment cells die, the hair grows in completely gray.he Graying Process. With age, the pigment cells in a hair follicle gradually die off. As they do, that strand of hair will no longer grow in with as much color and will show up as more silver, gray or white as it continues to grow.