Library spokeswoman Celeste Jackson said the woman walked into the library Tuesday, said she had been riding a city bus and was in labor.
She gave birth just inside the library entrance.
Staffers and security guards helped until paramedics arrived and took the mother and newborn girl to Denver Health Medical Center.
Jackson said staffers didn't yet know their names but they want to send flowers. She says, "It's never happened before."
Hospital spokeswoman Betty Rueda said the mother was in good condition Tuesday evening. She declined to release information on the baby, citing privacy rules.
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