There is no definitive answer to this question, as every child develops at a different pace and has different interests. However, some general tips for choosing books for a six year old would be to look for books with lots of pictures, simple storylines, and age-appropriate vocabulary. You might also want to consider books that are part of a series, as these can be especially engaging for young readers.
Here are some specific book recommendations for six year olds, organized by genre:
Fiction:
-“The Cat in the Hat” by Dr. Seuss
-“Green Eggs and Ham” by Dr. Seuss
-“The Very Hungry Caterpillar” by Eric Carle
-“Make Way for Ducklings” by Robert McCloskey
-“Corduroy” by Don Freeman
Non-Fiction:
-“The Magic School Bus Lost in the Solar System” by Joanna Cole
-“National Geographic Kids First Big Book of Space” by Catherine D. Hughes
-“Dinosaurs” by Gail Gibbons
-“My First Human Body Book” by Patricia J. Wynne
Picture Books:
-“Where The Wild Things Are” by Maurice Sendak
-“Caps for Sale” by Esphyr Slobodkina
-“The Mitten” by Jan Brett
-“The Snowy Day” by Ezra Jack Keats
-“Make Way for Ducklings” by Robert McCloskey
Chapter Books:
-“The Boxcar Children” by Gertrude Chandler Warner
-“Judy Moody” by Megan McDonald
-“Dragonbreath” by Ursula Vernon
-“Geronimo Stilton” by Geronimo Stilton
-“A Series of Unfortunate Events” by Lemony Snicket