My daughter is 3 Months old and in two days we are flying out of state. I have her social security card but not her birth certificate (it’s with her father which is already where me and her are flying too). We are flying with spirit airlines, and she is checked in as a lap child. Will they not let us board if we don’t have the birth certificate? I know they like to have the birth certificate since it shows her birthday, but she definitely still looks like an infant. I don’t want to get to the airport then find out I can’t take my flight because I don’t have her birth certificate.