The best thing to do with your stroller is to check it at the gate. You can take your stroller through security and then use it the entire time you are in the airport. Check in at the gate before you board the airplane and they will put a claim check tag on your stroller. Then when you board the plane you just leave it right outside the airplane at the end of the jetway. From there it will get put on the airplane. The great thing . . . when you get off the plane at your destination, it will be waiting right there outside the plane for you again. You can load it up with your child and carry-ons and be off through the airport with ease.
One thing to note - When you go through security they will ask that you fold up your stroller and fit it through the x-ray machine. If your stroller does not fold up that compactly, don't worry about it. Just tell the TSA agent and they will have someone manually inspect it. I have flown with my double stroller many times and this has never been a problem. You will have to empty out your stroller and remove your child first.
how much luggage am I allowed to bring
They are not allowed where all the people are. However you can bring a stroller and have it in the storage area down below.
don't bring liquids
Only if it clears security.
Click on the link below to see the security policy for Yankee Stadium.
luggage that has no dangerous objects in it such as drugs that are illegal, poison, guns and etc.
I think you are allowed knitting needles in your luggage that goes into the plane hold (main luggage), but you are not allowed them in your hand luggage because they can be classed as dangerous. If you want to knit on the plane, I have used pens before. If you use some thin pens or pencils, that should work.
Either you won't be allowed to bring it. Or if they're feeling nice, they might cut you some slack and let you bring it anyhow.
I guess so. But you surely can't bring canned food in you carry-on luggage.
can we bring our ps3 on hand luggage
No
No, Nothing other than personal strollers.