This is how to get a baby to sleep while at a noisy mall:
Andrew loves looking around at everything so when we're in public it's hard to get him to take a nap, even when he's really tired. So I usually end up nursing him under a cover but then I'm stuck holding him until he wakes up. This worked better.
He didn't sleep for long, but he got enough rest that he was happy for the rest of the outing. Works for me :)