Kristine Casey offered to act as a surrogate for her daughter Sara Connell, who had been trying for a baby for several years.
Ms Connell, 35, and her husband Bill are the biological parents of the baby boy, Finnean Lee, who was conceived through IVF, but carried by her mother.
Ms Connell became pregnant after undergoing IVF treatment in 2004, but delivered stillborn twins, and later suffered a miscarriage.
She held her mother's hand as Finnean Lee was delivered at 39 weeks by caesarean section, the Chicago Tribune newspaper reported. When she heard her baby cry out, she was overcome with emotion.
"I lost it. It's such a miracle," Ms Connell told the Tribune.
The new mother was not the only one affected by events.
"The surgery itself was uncomplicated, and the emotional context of this delivery was so profound," said Dr Susan Gerber, specialist obstetrician at the Northwestern Memorial Hospital in Chicago, where Finnean was born.
Ms Casey, from Virginia, had previously delivered three babies, the last one some 30 years ago. She is thought to be the oldest woman in the state of Illinois to give birth.
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