Miller, a veteran marathon runner, ran the race while 38 weeks pregnant. Babies are considered full term after 37 weeks.
She half ran and walked the 26.2-mile course in six hours, 25 minutes and 50 seconds.
When she crossed the finish line around 3 p.m., she said she felt a twinge. She headed to a hospital where she gave birth around 10:30 p.m. to a healthy, seven pound girl, named June.
The fetus is very, very well-protected in that uterus, because it’s in amniotic fluid,” said Santiago-Munoz, an expert in high-risk pregnancies. “The baby is floating in there. It’s very buoyant.”