My mattress pads have the quilted pattern on them. You are going to put a tight fitting crib sheet over the pad so I wouldn't worry about it unless the quilting is really thick and excessive.....
Our pad is somewhat quilted and, with the sheet, it will be fine. I wouldn't stress to much about it. Now if your sheet doesn't fit over the mattress and pad, then I'd worry.
Re: Dumb question re: mattress pads.
Nope, not excessively thick, but it does squish down a slight bit when I press on it (with the sheet on top).
I think I'm just getting paranoid.
mine is a quilted waterproof pad.
It's quilted but not pouffy so I don't think it's a problem.