This is it: the most wholesome children's book I've ever run into.
Some weeks ago I was chatting to my girlfriend, complaining about being stressed and tired. Louisa's reply: "Would you like me to read you a Milly-Molly-Mandy story?" I'd never read the book and didn't really know anything about it, but it sounded nice. First Louisa read me some of the stories in a random order, a story or two every day, but we soon figured out that we should just start from the beginning and read the whole thing. We finished today, and saying goodbye to Milly-Molly-Mandy was v sad.
The series turned 90 years old this year so it's not the most current one, but imo it has aged very well. The stories are about stuff any child could potentially be interested in; finding an abandoned train, getting a pet hedgehog, having your teacher spend a few nights at your home, and going to the coast for the first time. None of the stories are moralising, and very few of them present an overtly normative idea of gender. The most important message of Milly-Molly-Mandy is that one should be kind to others, which, I think, is what everyone should aspire to. (In one of my fave stories Milly-Molly-Mandy finds out that there's A MEAN GANG in her village so she and her friends start A KIND GANG, and soon the members of the other gang start to get bored of doing mean things and even join MMM's gang of kindness.) The stories are just endlessly nice and cosy, without any huge conflicts or drama. I found them genuinely funny as well, although that is partly thanks to my gf who is an excellent reader.
If you want to read a collection of children's stories where nothing bad happens, that is comfy and nice in the best possible way, this is the book for you. Also, I heard Sir Ian McKellen has said that the series is his favourite children's book so. There's that.