I own a nikon D60 and have recently upgraded to a nikon D750. There are lots of things in the D750 to prevent accidental misconfiguration of some settings (like a small lock on the P-S-A-M dialer) that the D60 didn't have, and that's nice. But one thing that seems to me that is very important and it is in the same state in both models is the deletion of photos. You press the 'trash' button and it asks you for confirmation, and press it again and voilà, your photo is gone.
I have expected that to remove a photo you should do something a little more difficult than pressing the same button twice.
As maybe some of you may be guessing, the problem is with my son. We usually let him hold the camera while we playback the photos and let him press right or left to view another photo. He is very young (2yo) and still doesn't understand what each button do. He instead keeps pressing all buttons while yelling 'button! button!'. And sometimes he accidentally deletes a photo or two. I don't want to punish him nor take the camera away from him because he doesn't still know that he is doing something wrong.
So all this introduction is to just ask the following question: How can I let my child play with the camera and be sure that he won't delete any photo? Is there any setting to change the behavior of the trash button, or to auto-protect a photo just after taking it?
note: for those concerned with the integrity of the D750: No, I won't let him play with the camera for the moment, but when the moment arrives I want to be prepared.