Why does a baby kick in the womb?

Scientists have modeled the movements of newborns and infants by developing a skeletal-muscular system algorithm based on the activities of 22 babies. They identified a pattern of muscle interaction that develops in infants based on "exploratory" behavior. The movement techniques developed in the womb help them perform coordinated movements later in life.

In the fetus, hundreds of neurons synchronize to control each muscle in the body, creating strong contractions that activate "sensors." Spontaneous movements, which don't have a clear task or goal, contribute to coordinated sensorimotor development.