WHO recommends that children sit less and play more. Read the report 

“The pattern of overall 24-hour activity is key: replacing prolonged restrained or sedentary screen time with more active play, while making sure young children get enough good-quality sleep. Quality sedentary time spent in interactive non-screen-based activities with a caregiver, such as reading, storytelling, singing and puzzles, is very important for child development.”

Good advice.

Ps. The kind of play being discussed does not include computer games.