The novelty will wear off. We put dd in a basinet to sleep during the day in the lounge so she's a little harder to reach. If I had to leave the room to do something and I couldn't keep an eye on them id call ds to come and help me. Our biggest issue was eye poking. We have taught him now that eyes are special and you can't touch them, so now he will just point and say "eye beshal!".

I didn't really put her up out of his reach (apart from the basinet, but it's an old style with slat sides like a cot, so he stil puts his arms thru and pays her on the head ^^. I didn't want him thinking that they weren't equal iykwim.