The book I am looking for is pre-1970, I believe. It is about a grumpy owl who is getting upset with the pixies (?) who are having a party and keeping him awake. Finally, the party is over and it gets quiet. Then he hears crying, and finds a lost child in an acorn cap. I don’t remember much else, but I believe the owl took him back to his family.
This sounds like an Elsa Beskow book. Perhaps it’s Woody and Little Pip?
No, but thanks for the suggestion. I believe it was all black & white, and it was just the owl and the child for the characters. I don’t think it was a very big book. I’ve been looking for this book for over 45 years! Isn’t it funny how some things stick in your mind and never go away?