by 
The Curious Bag
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Most hair loss in children is a perfectly normal consequence of development, and should not be a cause for concern. However, in some cases hair loss---also known as alopecia---signals a medical problem.
Baby Hair
Your baby sheds his first bit of baby hair by about his six month, to be replaced with more permanent hair. With blond and red hair, the shedding happens earlier, by about two months of age.
Friction
Friction can cause hair loss---when your baby sleeps with her head to one side or her head rubs against the back of a car seat. The hair will grow back when she is more mobile.
Pulling
Hair can fall out from brushing too hard or pulling it back into a tight ponytail. Using a soft brush and tying hair loosely prevent this problem.
Alopecia Areata
A small circular bald spot can develop in children and teenagers who are mildly allergic to their hair. Sometimes it grows back on its own, but if hair loss is extensive, medical intervention may be required.
Malnutrition
The last major cause of hair loss in children is malnutrition or a severe medical problem. If your child is losing a significant amount of hair after he is six months old, call the pediatrician.
Source:
"Caring For Your Baby and Young Child: Birth to Age 5;" Steven P. Shelov; 1991
"Your Baby's First Year: Week by Week;" Glade B. Curtis and Judith Schuler; 2005
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