Gene J. Puskar / AP Photo

Rick Santorum's daughter, Bella, who suffers from a rare genetic condition called Trisomy 18 is expected to be released from the hospital Monday pending doctor approval, a spokesman for Santorum said Monday.

During an interview on MSNBC this morning, Hogan Gidley, national communications director for Santorum, said Bella, who was admitted to the hospital on Friday, is doing much better and Santorum is expected to return to the trail tomorrow.

Read more about Trisomy 18

Bella was admitted to the hospital on Friday, but it is unclear what symptoms she exhibited that led to this hospital admission.

"Rick and his wife Karen have taken their daughter Bella to the hospital," said Santorum spokesman Hogan Gidley in a written statement Friday. "The family requests prayers and privacy as Bella works her way to recovery."

In January, the Santorum family took Bella to the hospital when she contracted double pneumonia in her lungs.

Bella Santorum suffers from Trisomy 18, a rare, but serious genetic condition Trisomy 18, which kills about 90 percent of children before or during birth. Bella has defied those odds and is three years old.

Bella's condition has had an effect on the campaign trail. Mitt Romney's campaign said it would yank a negative television ad from the Pennsylvania airwaves "until further notice."

Santorum had cleared his Monday schedule, but currently has two events scheduled in Pennsylvania on Tuesday - a morning rally in Bedford and an appearance at the "American Heartland Conversation on Faith, Family and American Values" at Lancaster Bible College in Lancaster in the evening.  He will campaign in the Keystone State through Thursday and speak at the NRA conference in St. Louis, Missouri on Friday.

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See the latest Good Morning America report on Bella and her condition: