In September I have these pages posted on a wall and I have my students come and write their name, grade and birthday number on their appropriate month. Eg. Lisa 4ieme annee -22 under septembre.
Then, I put them in a pile and clip them to my white board next to my calendar. When a child is having a birthday I fill it in on the final page to recognize them. Each month I change the month page.
All of my FSL students (grade 4-8) love it, and I have birthday crowns they wear on their birthday!