Hi Jessica! Thanks for bringing your question to planDisney.
We brought my eldest to the parks for the first time when he was four months old and our youngest at three months old. It's magical! They're portable and content so long as you can meet their needs. Take advantage of the
Baby Care Centers conveniently located in both parks to assist you in keeping your baby dry, fed, and happy. These complimentary centers are great places to change a diaper, nurse, warm a bottle, and more. In my experience, they're impeccably clean and saved us when we were traveling with babies and toddlers. You can even purchase necessities like diapers, formula, wipes, pacifiers, and over-the-counter medicine. So if you don't want to pack a full diaper bag or you run out of something, the Baby Care Centers can save the day.
Unfortunately, at this time,
park rules state that only small glass containers, such as baby food jars, can safely enter the parks. Many baby food jars are smaller than a 4 oz glass baby bottle. If you're okay with potentially being asked to leave it behind or return it to your hotel or vehicle, you can see if your bottles meet the safety standard in size. But I would definitely have a plastic option with me just in case. Alternatively, just bring the plastic and leave the glass ones at home. I understand you might not be stocked with plastic bottles if you've chosen to use glass, but hopefully, you have enough time to grab a couple of bottles that can be reserved for situations such as these.
Have a magical time!
Elizabeth