Hello there Kendell, welcome to planDisney!
How exciting that you will be taking a trip with your little Mouseketeers later this year! I have such wonderful memories of taking my kids to the Disneyland Resort when they were that young, my daughter visited when she was just four months old!
For attractions where there is no height requirement, most likely it should not be an issue for you to hold your infant in your lap and have one of your little ones next to you. While exploring the
list of attractions at both
Disneyland Park and
Disney California Adventure Park, you can filter by "Height" to see the list of attractions where there is no height requirement. Some of my favorite attractions where you could have your infant on your lap and have either your 2 or 3 year old with you are Alice in Wonderland in Disneyland Park, and The Little Mermaid - Ariel's Undersea Adventure in Disney California Adventure Park. I also wanted to note that if your 2 or 3 year old also wants to ride the attraction and there is only room for two of you in the attraction vehicle, they will need another adult to accompany them on the attraction, they will not be able to ride alone.
If you are in need of a calmer place to change a diaper, or need a quiet space for any of your little ones, I highly recommend stopping by the
Baby Care Center, there is one located in each theme park. They have baby essentials if you run out of any supplies, and I always enjoyed a nice calm break from the hustle and bustle of the theme parks. The Cast Members are wonderful, and always took such great care of me and my family!
I hope this helps answer your question, Kendell! I've taken plenty of trips with little Mouseketeers, so do not hesitate to
follow-up with me directly if I can help with anything else for your upcoming trip.
Have a magical day!
Melissa