We took our oldest (who is now 5) when she was just about 8 weeks and we had a WONDERFUL time. I had no problems breastfeeding or bottlefeeding (I did both). I second RobinB's recommendation for a Snuggli carrier. It was a lifesaver for the waits in line and babyswap worked great. We have a trip planned in November and our youngest will be about 12 weeks. I can't wait. If there was anything negative about the first trip with an infant, I wouldn't have scheduled one with our new daughter. It really depends on you and your parenting style -- we take our daughters everywhere with us (even to the office fortunately) -- so the minor inconveniences of lugging diapers, stroller, carrier, formula, etc. are just that, minor. Besides, we'd be doing it at home too, so why not enjoy WDW while doing it? Enjoy!