As your precious child starts to grow, so to their motor skills begin to develop. When a baby is born, their muscle development starts in their head and neck. As they develop the ability to move and control these, they will then progress onto the large muscles in the body such as their core, legs, and arms. It is likely that when your child reaches the age of two, they will be able to walk and run, and their gross motor muscles will continue to improve and refine throughout their childhood.