Does anyone have any activities they play/do with their baby that they've found particularly good? I put Lucy under her play gym and in her swing, but apart from that I've only really found that reading to her and talking to her are things she likes. She likes her musical mobile while she's in her cradle.

I'm sure there are other things that are fun that babies love! Lucy seems to be awake for much longer stretches now and I'd like to know what I can do with her.