I feel just a little bit special having the rarest birthday (26th December). It's definitely the worst birthday - literally no one cares. This year I'd eaten so much on Christmas Day and Christmas Eve that all I wanted was some vegetables and a run.

https://www.ons.gov.uk/peoplepopulationandcommunity/birthsdeathsandmarriages/livebirths/articles/howpopularisyourbirthday/2015-12-18

How popular is your birthday? - Office for National Statistics

A peak in births in late September show that more babies are conceived in the weeks leading up to and days after Christmas than at any other time of the year.