When I was pregnant and went to Disney I brought my own fan and it was a lifesaver!
A chargeable neck fan and an extra small USB charger. Snacks and FROZEN water. Sunscreen. Sunhats. Jammies in the car for the ride back home or to the hotel and a tooth brush so that they do all that before they get in the car and when we arrive they can just go to sleep.
HIP CARRIER! I went for the first time as a mom without one and refused to do it ever again.
Careful your stroller doesn't count as a wagon, they won't allow it! My stroller didn't have a bottom carrier and they said that made it count as a wagon
Hope this link helps https://magicaltourguide.com/guide-for-pregnant-mamas-going-to-disneyland/
stroller packed up with lots of snacks & water!! extra change of clothes for your toddler just in case. sunscreen.