Lucy Cousins is a delightful author and illustrator for young kid's books. I have been reading Hooray for Fish! to young children for the past few months- what a hit!
They LOVE the bright colors
and the warm story of a little fish and his mommy.
Maisy books are also a hit with my grandkids and the young children I read to every day. My 2 year old granddaughter can rattle off all the Maisy characters in a flash- Eddie, Tallulah, Cyril, etc. Here are a few of the books that I read to them

I highly recommend Lucy Cousins books, for babies through 1st graders.