‘Teach your child to read
a page of the book aloud
and to hold up one finger
for each word that they don’t know.
If your child is holding up
four fingers and a thumb
before finishing the page,
the book is probably too difficult.
It may be one, you and your child
could read together instead.’
Please note, this is a recommendation
we have found several places on the internet,
so we cannot attribute it to its original author.