I'm following everything in the app but my daughter was born 6 weeks before her Estimated delivery date. Should I be using her birthday or her EDD?

Hi, thank you for your question! Dr Frans says that you should use the EDD, as development starts at conception, and not at birth :) Whether you are giving birth early or late, does not speed up or slow down your baby's brain development. You can watch a recorded version of Dr Frans' live Ask the Expert Session here: https://www.facebook.com/parenttown/videos/1258235770909093/

As a guide, you should be using her EDD. However, I have a friend whose baby was born 4 weeks early, she noticed that her baby seemed to go through her leaps somewhere in between the predicted (based on EDD) dates and her actual birthday. So I think you may expect your girl to be somewhat similar. She may go through a leap slightly earlier than the predicted dates.