As soon as you see your baby manipulating things with his fingers and have decent control over them, show them how to turn the light on and off. A couple things to consider: make sure the switch is VERY easy to turn on and off, otherwise, your baby will just be frustrated. It’s better not to do it if they will just be frustrated.
I showed B and M how to turn the light on and off using the light dimmer in our bathroom because it slides very easily, whereas the dimmer in our bedroom is very tight and you really have to push hard to turn it on and off. It’s difficult even for an adult. If you have the right light switch, this exercise can be so much fun and confidence-boosting for your baby, but if you don’t, there are many other things to do, don’t do this one!
Mackenzie is ready to do this at 8 months