Well, if you want to have a Christmas baby, you need to start planning early. According to Elf tradition, you should conceive during the month of October to ensure that your baby is born on or around December 25th. However, this isn't a hard and fast rule, and there are always exceptions. Some elves have been known to conceive in the months leading up to Christmas, and still have a Christmas baby. The important thing is to plan ahead and make sure you have everything in place to make the birth a special and joyous occasion.