Yes, you are absolutely allowed to bring baby food into Disney theme parks, including both Disneyland Resort and Walt Disney World. Disney's official policy allows guests to bring their own food and non-alcoholic beverages for self-consumption, provided they are not in glass containers. However, an exception is specifically made for small glass jars of baby food. If you need to heat the food, you can visit the Baby Care Centers located in each park, which offer microwaves, bottle warmers, and private nursing areas. Most table-service restaurants can also assist with heating pouches in hot water. Additionally, Baby Care Centers sell essentials like formula and jars if you run out.