[McheleM]

God i love google!!!

There are a number of variables that may affect nail growth;

Nail growth is different from person to person and from finger to finger. The nail on the middle finger grows the fastest and the nail on the little finger grows the slowest.
Nails grow from 0.05 to 1.2 millimeters per week. If a nail is lost, it may take seven (7) months to grow out fully.
As a rule, the nails of babies and older folks grow more slowly than those of teenagers.
The length of the finger and the size of the lunula or moon suggest the speed of growth of the nail. The shorter the finger and the less of its visible lunula, the more slowly the nail will grow. (The thumb is the exception.)
Biting fingernails, while detrimental to their health in other ways, is thought to make them grow faster.(Just trim them, Don't bite!)
Fingernails grow faster than toenails and all nails grow more quickly in the summer than in winter or cold weather. Heat increases the rate of all metabolic processes.
Nails grow faster during the day than at night due to the natural pulse of the body rhythms.
Mens nails grow faster than womens do. However, women will experience a spurt in nail growth just before menstruation and during pregnancy. These growth spurts are thought to be in response to hormonal activity.