Hey there, hi there, Bethany! I'm so excited to hear you'll be heading to Disneyland Resort with three little Mouseketeers.
Those age gaps are almost identical to my three kids, although they are a bit older now. For a three-day trip, I always recommend a
3-day park hopper ticket. This allows you to really enjoy each park and figure out your party's wants and needs and adjust accordingly. The two parks are really just a minute or two walk from each other, so it's so easy to go back and forth.
If park hopper tickets are not an option, I really think it depends on the kiddo's interests. I definitely recommend one day for each park, but you'll have to decide where you think you'll want to spend more time. Disneyland Park definitely has more attractions and quite a few attractions all ages can enjoy. This is where you'll find the more iconic rides for the younger ones in Fantasyland. Star Wars: Galaxy's Edge is also located in this park if you have any Jedis and young padawans. I feel like this is the park a lot of families with little ones gravitate towards. I really love Disney California Adventure Park too for littles. This is where you will find my favorite, Cars Land, and the newest land at Disneyland Resort, Avengers Campus. There is also Redwood Creek Challange Trail that lets your Mouseketeers get their wiggles out between attraction wait times.
I recommend taking some time to check out the
Disneyland app, specifically the parks map. Here you can get an overhead look at the attractions and lands. You can click on each attraction and it will give you more details about what kind of attraction it is and if there is a height requirement.
Bethany, I hope this helps you with your planning. Whatever tickets or parks you decide on, I know you will have a wonderful time at Disneyland Resort.
Carrie