My wife and I will have a 10 week old with us in September. How hard is it to go to Disney World while taking an infant? We will also have our 4 year old and 19 year old. We were supposed to go in June then found out we were pregnant. So we pushed it back to September. Also, we had thought about leaving him with our parents but shipping breast milk was going to be a pain. Any information you can give me would be very helpful. My two concerns were 1 - the heat and 2 - not wanting to take away from our 4 year olds first visit.