Happy Birthday to the best mom I’ve ever had!

Don’t worry, I gave no hints about the year you were born, nor how old young that makes you this year. No hints at all. And no, I’m not sure why I decided that’s the shape a cake should be. I hope you enjoy the puzzle nonetheless!

Rules:
Normal Sudoku rules apply.
Digits within circles appear at least once in cells touching the circle.
Digits within cages do not repeat, and sum to the total in the top-left corner of the cage.

Estimated difficulty: 1 out of 5

Solve on SudokuPad
Happy Birthday, Mom!