(NBC) McDonald's is making changes to its popular Happy Meal.
From now until Feb. 15, Happy Meals will contain one of four kid's books instead of a toy.
It's the third time the fast food chain has served miniature paperbacks instead of plastic toys in its Happy Meals.
By the time this year's giveaway is over, McDonald's estimates it will have distributed 50 million children's books.
— McDonald's (@McDonalds) February 2, 2016