Disneyland with a 3 month old

Rebecca
What do people think?? My niece turns 5 at the end of February and my sister is taking her to Disneyland (California one) for a few days. If I went, I'd leave on a Friday morning and come back the following Monday. I'd take her stroller, car seat, and a wrap. I realize rides are basically out of the question, but I really want to experience this special event with my niece. Baby girl will be about 3 months old. Obviously I'd ask her pediatrician what she thought, and if it's a no go I wouldn't go. But what are your opinions?? Would you go to Disneyland for 3 days with a 3 month old?? If you have, do you have any advice??