DD2 is 3 weeks old and DD1 (3 years, 2 months) is finding her way through the challenges of having a younger sibling. She's doing well over all, but I am concerned about how she handles her sister sometimes; she'll sneakily squeeze her really hard when giving her a cuddle, serruptitiously try to go in when she's napping to wake her up, or 'accidentally' pull her hair hen stroking her head. She might start off singing her a song, gently and quietly, but then suddenly screech really close to the baby's face. You get the picture. I'd never turn my head from her when they're together.
I've tried really hard to carry on DD1's routine and day to day activities as closely as possible, so superficially she isn't really missing out on her life before DD2 came along; if anything she has more quality time with either DP or me as DP tries to take her out for something fun (zoo, swimming, park etc) most days so I can catch up on a bit of sleep.
I let DD1 help with baby care stuff like nappy changing, bathing, dressing etc, as I do want her to feel included and not perceive that "mum and DD2 are having a nice time together without me" kind of thing. She gets to hold her, propped up on pillows on her lap, under supervision. But, as I said, every so often she does something quite mean and potentially dangerous. How can I incentivise DD1 to be gentle and careful with her sister? Ideally, I'd like to engender a deeper sense of intrinsic motivation (such as "Aw, isn't she tiny, I'd better be gentle with her..."), as opposed to a shallower extrinsic set of motivators (eg "Mummy will go nuts of I lean on the baby again."). I don't want to have to say "Thay's IT!! You can't be anywhere near DD2!"
Any ideas?