I suppose you could just call and ask. I think it just depends on what it looks like when it goes through the scanner. They can tell if something is a liquid through the Xray. If you have something that they detect as liquid they'll make you get rid of it (or you can put it in your 1 sandwich size baggy if you don't already have one for other stuff). But if you're concerned I would just call and ask whichever airport you're flying through. I was suprised Burbank seemed stricter then JFK.
) for what is allowed and how to pack it. Formula is on the exception list but they may limit the amount so you probably should check. It might be better to bring powdered formula and buy water on the other side of the x-ray.