This is from 2019, I'm hoping OP has figured it out by now...

Mine is kelly green, with white and light blue accents.

We have two boys and let them pick the colors when we redid their bathrooms at ages 5 and 7. One chose blue walls and the other chose a golden yellow. Its been 7 years and I now that they are in the early teenage years I think the blue looks more juvenile than the yellow. It depends on how long you think you'll have the color before changing. If it's only a couple of years let them choose.

Get a paint deck or go to a paint store.
Look at the grays and then move toward the undertone you like (blue, green, purple or pure gray)
It's the best way to avoid those paints that are way too bright.
It's rare you will find a really great blue or green that does not have some gray in it.

Pure white is very popular now but it can look sterile if you don't have a plan (area rugs, window treatments, layered bedding)

Anonymous wrote:Newburyport blue or gill wing gray Benjamin Moore.

We are doing Dunmore cream, I like Newburyport blue, we have it in our family room. I may do one wall in that or hale navy, preferable his desk wall.

I guess I love blues. I’ve done a medium tone blue and now navy

Anonymous wrote:

Anonymous wrote:What ever makes them happy.

OP here and they’d probably go with purple or neon green or pink.

I'd go with blue or cream and put up some purple, neon green, and/or pink wall decals. They're pretty cheap and they can enjoy them for a few years and swap them out for something else when they're older.

Benjamin Moore Featherbed is a nice pale yellow if the rooms have good light. I have that in one kid room and revere pewter in the other. Both have been neutral enough colors to work with any bedding and other decor.

Anonymous wrote:You're probably looking for actual names of paint colors, so sorry, don't know that, but I would go for a blue with lots of gray in it so that it doesn't look too babyish as they grow up.

I picked the below for my kids for just that reason.

https://www.benjaminmoore.com/en-us/color-overview/find-your-color/color/1665/mozart-blue?color=1665

Anonymous wrote:

Anonymous wrote:What ever makes them happy.

OP here and they’d probably go with purple or neon green or pink.

So just leave the pink for now and save yourself some effort! They may care more in a few years.

Anonymous wrote:

Anonymous wrote:What ever makes them happy.

OP here and they’d probably go with purple or neon green or pink.

Why not paint stripes using all three of those colors? They all go well together.