I found putting Jacob in his rocker was great. It had little toys on it that he could look at. I would just take him from room to room in it and talk to him and he'd watch what I was doing. When the weather was a little warmer when he was a few months old I'd even take him outside in his rocker (it had a hood that would pull over on it for sun protection) whilst I was putting the washing out, or just to sit out in a different environment for a while......

We also had a play gym that I'd put him to look at the toys dangling from it.

Apart from that I'd cuddle him and talk to him, smile, laugh etc.....