Your middle nail grows the fastest and your thumb nails the slowest.

Which nail is the fastest to grow?

The nails on your dominant hand grow faster than the rest, as do the nails on your longer fingers. Your fingernails also grow faster during the day and during the summer.

Why do pinky nails grow faster?

Since your hands are closer to your heart than your feet, more blood will get pumped to your fingers than your toes causing more growth in the nails of the fingers. Research shows that nails grow more slowly in cold weather, when blood flow is restricted which also supports this claim.