People who are born in May are prone to be optimists, while those born in November tend to see the world through the opposite lens. Many researchers have tried to understand how different one can be based on the season and month they’re born in, and are succeeding at it. One study says that your birth season and month might influence your personality and skills. Actually, your health too, according to data gathered from 1.7 million people, studying 1,688 conditions.