My one month old moves his arms and legs a lot, he doesn't stay still, is this normal?

Normal pattern: Before the baby ever has control of their limbs,the brain sends out regular movement signals to every muscle in the body.This acts to preserve the muscle mass and tone in each so it will be available when baby gains motor skills to use them.This is seen as random stretching and flexing that seems to be for no purpose.However, without it, baby's muscles would be too weak to use later.