I had always thought that April/May was prime birthday season. So many of my family and friends have birthdays in that time of year. I was very surprised to f

I had always thought that April/May was prime birthday season. So many of my family and friends have birthdays in that time of year. I was very surprised to find that it was not a particularly likely time to have a birthday. I wonder if this error is common in other people. And if so, if there are social-network dynamics around birthdays that cause the bias.