I got pg with Parker the day after Jackson's first birthday. It was really hard to take care of him like I wanted to, but I figure that he'll never remember the amount of TV he watched.
The only way that I could tell that he really did understand was that when I'd go run to throw up, and my hair was down, he'd bring me a ponytail holder to put it up (at about 16 months old!). Another way was when we took his potty out of the box for the first time, he automatically went over to it, raised the lid, bent over, and acted like he was throwing up in it. (Apparently that was what potties were for.) Ultimately the hard time was over, and Jackson is none the worse for wear.