I came across this really cute idea that is so much more personal than printing a name on a cupcake.
I took a picture of each child holding a small chalkboard which had their birthday number printed on it. I grouped students by their birthday month. Where two students have the same birthday, they are both holding the number together.
Instead of displaying this on a bulletin board (up high, where they can't even see it) I hung it on the back of my classroom door, where it is very visible. I used a small pocket chart held in place by over-the-door hangers. I then framed it out with a border, to finish it off.
My students L-O-V-E checking it out, to see who's birthday is next, or who has a birthday in the same month as they do.