DD3 (9m) has developed the habit of blowing raspberries while she is eating (mostly purees). I know its a petty thing, but I am SO ANNOYED by this. Basically I think her sisters laughed at her once, and now she is just super pleased with herself whenever she does this. I've tried speaking to her sternly with a grumpy face (she looks at me very seriously, then continues with her game), I've tried ignoring it, and just now I've stopped feeding her and have got my back to her. She's continuing to do it, and isn't giving up.

Any tips on how to stop this before it really becomes a habit?

She's also really into chucking whatever dishes/spoons/jars she can get ahold of - she shattered a pyrex baby food container the other day...such a different feeding experience than I had with my other kids!