What is the effects or impact if the child born on Purnima (Pournami)? What if you were born on Purnima day? Importance of Purnima tithi in Hindu calendarPurnima is the fifteenth tithi in Shukla Paksha (bright half) in a Hindu month. Purnima marks the fifteenth day of Hindu month in Amavasyant Lunar Calendars (Marathi, Gujarati, Telugu and Kannada calendars). Effects of child birth on Purnima tithi..