Hi Reynaldo,
I took my daughter to Disney World for the first time when she was 18 months old; my son when he was three months old. Both times were sooo wonderful. Disney sure makes traveling with our babies and small kids really easy!
As you may already know, children under the age of three do not need admission tickets or MagicBands to enter the theme parks. There are also
Baby Care Centers in each theme park. They allow Guests with babies and toddlers to take breaks from the crowds, and have quiet and calm feeding and changing times. There are also baby supplies available for purchase should you find yourself in need of something. The Centers carry disposable diapers, some different brands of baby foods and formulas, as well as some over the counter medications.
Please check out the
Attractions page on Disney World's website. Attractions that say Guests "of any height" are perfect for the kids in your group to enjoy. I also suggest that you look at
Disney's Planning for Pre-School Kids & Little Ones page. It will help you plan a kid friendly vacation for you and the kids.
Thanks for visiting the Moms Panel, Reynaldo. Wishing you a very magical vacation!