The Sims 4 children can't run to lose weight, but they can lose weight by adjusting their diet.

You can choose more vegetable salads and eat less high-calorie foods.

In The Sims 4, the Sims last for 20 days from childhood, youth, middle age to old age, changing the physical appearance of the Sims. Two days before growing up to the next age group, the system will prompt the citizens' birthdays, and players can choose to prepare a birthday party or let the citizens age naturally.