Looks like a lot of hot air is being generated in response to this post.
As usual - really good advice about these kind of situations is difficult. So I am giving really obvious - "Richard Cranium" advice.
1 - use good tires that are noted for puncture resistance.
2 - use the best fitting tube possible - usually the biggest you can fit in the tire.
3 - inflate the tire to a pressure that supports whatever the load may be
4 - remind the young rider that they are responsible for avoiding flat tires
5 - use your own experience to warn the rider about where they should be careful about tire hazards - be it glass on the road or thorns in the grass, etc etc
Go to a phone forum if you want to post about phone usage and parenting. :-<
.