If you have a child born on the 29th then you do not celebrate it in non leap years and if they complain ask them why do they have the impertinence to think life should be fair.
They only get one birthday once in four years so they better live with it
If they feel they are missing out TOUGH
If anyone else sends presents or cards, just ship them back telling them not to send them until there is a 29 February
Otherwise how are the little brats going to learn that life is not fair and the world does not owe them a living