Amazon always has a daily offering of children's books that are free for the Kindle. Here are a few that I found today. Please note that while they are free as of the time of this posting, prices can and do change without warning. Always verify the "Buy" price prior to your purchase.
Teddy Bear Town Bundle
This collection of three stories is made to teach children while also sharing a fun story. In The Flag Keeper, children learn about respecting the flag. Victoria Rose and the Big Bad Noise helps children to not fear household noises. Sticker Shoes is supposed to teach children how to problem solve and learn independence.
The Little Red Fox and Lufa the Lab
This book is one of the Little Red Fox books based on stories from the author's childhood. In this one, the Little Red Fox saves Lufa the Lab from Farmer Brown and learns lessons in courage and helping those in need.
Little Sister Sounds
Babies make all kinds of sounds, each one meaning something different. Join a daddy and a big sister as they learn what the new baby is trying to tell them.
The Monster on Top of the Bed
This book is written for children with three lessons in mind. First, those scary monsters can be banished! Second, friendship conquers fear. Third, make friends with The Golden Rule. It helps kids feel safer about falling asleep at night.