A baby conceived on or about Valentine's Day (February 14 + 9 months = October 14).
Generally used to indicate a baby conceived during a brief relationship growing out of the Valentine's Day culture (often a one night stand).
"Did you hear about Wanda's October baby?"
"No way, really? Wait, was it that guy who she thought was going to be 'the one', just like she does at every Valentine's party?"