Umm, sounds a bit like your trying to set a formal education thingy. Not sure what I think about that.
I like what the other folks had to say. At 9 months I guess he is sort of getting mobile now and wants to explore his world. By now he has had his fill of being carried around and looking at everything. You did give him plenty of in-arms experience I hope. After all, they learn as much by observation from the safety of mum or dad's arms, and more than if in a pram or cot or playpen.
What to do. Well, by now he would be wanting to stuff every thing he can lay his hands on into his mouth. Some things you would prefer never got in there. But no matter; it will build up his immune system. So get his high chair, you do have one of those things I presume and put him in it whilst you do the food preparation. Oh, don't forget let him do the taste test. It also add a new dimension to his diapers when next you change them. You can give him a running commentary on the benefits of this vegetable over that one. Of course this is a good time to talk about fractions and other maths equations. Not that he will understand much, but he will like the sound of your voice and wont get bored. Boredom leads to whining kids and that will never do,
When you go do your laundry is the time to let him loose on the clothing. Now you can teach him about lights and coloured and the various things involved with hard and soft water and so on. Not that he will understand any of this, but he will think it's excellent that Mum is taking the time to chat.
Now I think about now you will have got the drift of where I am heading.
Now don't forget this is the time to talk about touching and boundaries and such.
Okay, I will shut up now.
Enjoy!