This book by Annebella Pollen looks superb. Also, I have a photo in it (taken when I was a child) www.theguardian.com/artanddesign...
theguardian.com
‘My first photographs coincided with me falling in love’: why children have always adored taking pictures
What makes someone pick up a camera at a young age, and what can their images tell us? A new book and show explore why a child’s first photo could be as formative as their first record