This article on the corelation between month of birth and increased risk of certian mental disorders appears to draw its inspiration from astrology as the title suggests. January and August seem the two safe months of the year to be born.
Being born between April and May is clearly not a good idea which is bad news for all Taureans. It makes for interesting reading whether or not you believe there is any truth or scientific basis to any of it. The March Hare was mad for a reason.