Goodness, don't start yet, you have YEARS of panic and worry to go through yet, the first two years, you run to A&E every time they fall over and the Dr's just look at you like you're crazy - which you are, but hey, this is the most precious thing in the world!
Wait until you really need to panic - I took Dylan down to A&E after he had a horrid bang to the head and they told me "well, even if his skull is fractured there's nothing we can do so you might as well just take him home and keep an eye on him"....excuse me??
Then when he broke his leg a year or so back, they told me he didn't cry enough when they squeezed it (or at all actually, he's a tough kid) that they were certain it wasn't broken. It was.
I made them put a cast on it anyway after taking him back FOUR times in a week because he couldn't walk, 6 x-rays later they just gave up and cast it. The follow up x-ray two weeks later proved it was broken, clean across his tibia.
Don't get worried now, it stresses the baby and it wont do ya any good. Wait until you catch him 8ft up a tree or eating dog food - then worry.
xxxxx