The normal cycle of hair growth lasts for 2 to 6 years. Each hair grows approximately 1 centimeter (less than half an inch) per month during this phase. About 90 percent of the hair on your scalp is growing at any one time. About 10 percent of the hair on your scalp, at any one time, is in a resting phase. After 2 to 3 months, the resting hair falls out and new hair starts to grow in its place.
It is normal to shed some hair each day as part of this cycle. However, some people may experience excessive (more than normal) hair loss. Hair loss of this type can affect men, women and children.
Most people lose about 50 to 100 head hairs a day. These hairs are replaced — they grow back in the same follicle on your head. This amount of hair loss is totally normal and no cause for worry. If you're losing more than that, though, something may be wrong.
Some major events can alter the hair's growth cycle temporarily. For example, delivering a baby, having surgery, or getting anesthesia can temporarily stop the hair growth cycle. (Because the hair we see on our heads has actually taken months to grow, a person may not notice any disruptions of the hair growth cycle until months after the event that caused it.) This type of hair loss corrects itself.
Eating a balanced, healthy diet is important for a lot of reasons, and it really benefits your hair. And don't forget to treat your hair well. For example, some doctors recommend using baby shampoo, shampooing no more than once a day, and lathering gently. Don't rub your hair too vigorously with a towel, either. Many hair experts suggest you consider putting away the blow-dryer and air drying your hair instead. If you can't live without your blow-dryer, try using it on a low heat setting.
Style your hair when it's dry or damp. Styling your hair while it's wet can cause it to stretch and break. And try to avoid teasing your hair, which can also cause damage. Finally, be careful when using chemicals — such as straighteners or color — on your hair.
Hope this answered some of your question.
Good luck and best wishes.