J.R.
A.,
I used to think my daughter would be fit for daytime television the way she would over-dramatize everything. I used to call her Susan Lucci - when joking about her dramatic displays of despair over the smallest of things.
I don't know, I mean I guess you need to make the best judgement call based on your son, his personality and the situation as a whole. Is it possible that he's over-doing this whole thing to get a bit more of your attention, now the new baby is here? sometimes these things manifest in the strangest ways... and some kids are such GOOD ACTORS - they deserve Oscars :)
If it were me, I would try talking with him, one-on-one, sit down with him on the floor (let the baby cry if needed, but do this without the baby on you... this may help him understand that he is still important to you) and tell him that you really want him to not be scared about what he saw, and you want to help him, but the only way you can help him is if you know what part was so scary. If he chooses not to verblize this, I would ABSOLUTELY sit with him on your lap thru the entire show and watch it again. if you sense him getting tense, pause it (if you have DVR) and discuss what caused him to be tense... assure him that it is just pretend, and only possible in the cartoons because people draw them. Some mom's may very much disagree with this approach... i'm not suggesting you force your kid to watch Saw II... this is Lilo & Stitch we're talking about here... and there is absolutely nothing for him to be afraid of. I am willing to bet that in the 5 short years he's been around... and with all the kids to compete with, he's deep down very happy to be getting your undivided attention when he has these fits...