Why Your Child Should Be Playing With Balls
You can introduce them to your child very early on because they immediately strengthen motor skills and familiarize little ones with their environment.
Early on, little ones gravitate toward things that roll. Your infant will be fascinated by a ball's continuous movement. Balls allow children to feel in control of something other than their own movements. Rolling a ball back and forth is a way to build a social bond between two people, and it's also a very introductory lesson of cause and effect.
Toddlers will discover a ball's abilities and the different effects of bouncing, rolling, tossing, kicking, and dropping it. A ball will remain an entertaining toy as your child transitions from independent play and parallel play to collaborative play which is vital in developing social skills, learning how to share, how to follow rules, and how to negotiate.
https://www.verywell.com/why-your-child-should-be-playing-with-balls-289705