Play is the highest form of research.
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Allow your kids to play as much as possible. Be it free play, toys or any physical activities they want to.
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It builds their physical stamina as well as their mental ability. Their imagination grows in time. .
A simple play doh brings out creativity.
A simple push and pull can make increase their motor skills.
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To add more just leaving behind kids surrounded by toys should be avoided as well. Sit down with your little one and play along. Know their imagination and applaud. .