We just got back and took my 17 month old niece for her first trip. She had a blast! This trip really made us realize that there is no age too young for Disney.
My sister brought their own stroller that they bought specifically for this trip and it was perfect - it had a tray, reclined so the baby could nap in the parks comfortably and we had a stroller sign made and laminated to keep on the stroller. We also bought a stroller gate check bag for the stroller on
Amazon, so the stroller wouldn't get damaged. That worked out really well and we were able to gate check it and had no issues. My niece loved being the stroller, but we made sure to let her roam around a little bit and in the lobby at the resort - she loved greeting people lol.
My sister packed LOTS of snacks and one of those great kids water cups that keeps the water cold for 12 hours. They sell Disney ones all over. We also brought a high chair cover for all of our meals. My sister is a huge germ freak and this was great and we just kept it under the stroller the whole trip and grabbed it when we ate.
We took afternoon breaks each day. We always did this before bringing a toddler to Disney, so this didn't change the way we do things normally. We loved spending time at the pool and just relaxing until heading back to a park in the evening.
We also made sure to bring a rain cover for the stroller. Thank goodness for this! It didn't rain as much as we thought it would for September. But one night in MK, it rained for hours, and the rain cover was a huge life saver! Whenever we parked the stroller to go in a show or on a ride, my sister covered the stroller with it, just in case a quick shower came through.
We booked an appointment for my nieces first haircut at Harmony Barbershop in MK. I would recommend this to all parents! It was the cutest experience. For $25, your baby will get a haircut, certificate, first haircut mickey ears and they give you a lock of their to bring home. It was quick, so we made sure to do it at park opening and the CM's were fantastic!