We went through about a month of it a few weeks ago, seems to have died down heaps now. The best is waiting behind people with DD sitting quietly in the pram, then she just bursts out an ear piercing squeal that frightens the crap out of who's in front of her. It is quite funny really....
Haha yep been there!! I've also been walking and Ds has squealed and on the way past someone will ask me if I heard that awful noise, not realizing who it was.

And does it really die down, or do we get used to it?