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 medulla in the center contains soft keratin and air. The cortex, the innermost thickest layer, has the pigment that gives hair color. The cuticle, the outermost layer, has cells that overlap like scales. Both the cuticle and cortex have hard keratin. The hair root in a hair follicle is embedded beneath the skin. The hair shaft protrudes from the skin. Hair sheds and is replaced constantly during growth and rest phases.