Forgive me if I am missing author names...
These are some favorites that we can't seem to get enough of, ages 2-4 mostly.
Caterpillar Pillow Fight
Edward the Emu
Martha Speaks (plus others in that series)
I Love My Mama
I Love it When You Smile (McBratney)
On the Night You Were Born
Llama Llama Mad at Mama
Llama Llama Misses Mama
The Very Hungry Caterpillar (Eric Carle)
The Big Red Barn (Margaret Wise Brown)
David Gets in Trouble
The Deep (Tim Winton)
Hondo and Fabian