If we find only a few photos, you'll see a message like "Only 10 photos found."
If your photos are stored outside your phone's camera roll, download them to your camera roll and start again
To keep going with the photos found, tap "Continue with [X] photos"
Try choosing a different date range or a different face if your child appears more than once in the face list.
The minimum page count for a Kid Yearbook is 20 pages.