As a kid, loved:

Harry the Dirty Dog series

Amelia Bedelia series

Little Toot

Katy and the Big Snow

Tikki Tikki Tembo

Eloise

Babar series

Others from Weekly Reader - including Gus was a Friendly Ghost, Be Nice to Spiders, The Mystery of the Great Swamp, and Mike Mulligan and his Steam Shovel

Later

Stuart Little series