Hi, Emily!
Congratulations on adding another Mouseketeer to your family! I am sure you and your family are excited for the new addition.
This is a question you will need to discuss with your physician. Please discuss with your medical professional any limitations and restrictions to keep you and the baby happy and healthy during your visit to the Disneyland Resort.
Now for a mom's perspective! I traveled to Walt Disney World when I was pregnant with each of my kids. I took a LOT of breaks, spent time resting in the shade of umbrellas and trees, and drank a lot of water. I was not able to go on most attractions, sticking to tame attractions such as
"it's a small world" and
Peter Pan's Flight. Believe me, that was fine with me as climbing in and out of attraction vehicles is not always easy. And the most important tip of all: Wear comfortable shoes!
As long as you are able to bring along another adult to help with your 3 little ones, and you are fine with breaks and relaxation, you can certainly enjoy a visit to the Happiest Place on Earth. Plan bringing or
renting stroller(s) for your kids so they can hop in for a rest and also to store any tote bags (you do not want to be carrying anything around all day).
Enjoy this magical time with your 3 kids, and have fun looking forward to another visit in the future with all 4 of your darling children!
Cathy