Disney land December ?

So me and my husband are planning on taking our 3 year old to Disney land for the first time for her bday !! She’s been asking and asking Her birthday is Nov 2 but I’m due with our second baby the end of October 20 so we are planning to take our daughter to Disney in December late bday gift

She will turn 4 years old I feel bad I won’t be able to plan a huge party for her how we usually do since I’ll still be recovering from giving birth of course she will get gifts and cake but not a huge party 😣 so I hope Disney makes up for it is December a good time to visit the park ?? Or is the summer better ? What’s the best thing about Disney in December?? (And no we won’t be taking our new baby with us on the trip we plan to leave him with my mom )