The naturally conceived quadruplets were born Saturday by Caesarean section at Intermountain Medical Center in Murray, Utah, the Salt Lake City Deseret News reported.
"It was amazing. It was a wonderful life experience," said father Anthony Consolo, who added the babies were "big and healthy."
"They are so cute, and they're doing great," Consolo said.
Natalie Consolo, the babies' mother, was resting and not available to comment, her husband said.
Medical professionals said the conception was particularly unique because the Consolos didn't use artificial fertility methods to conceive, The Salt Lake Tribune reported.
Without the aid of in vitro fertilization or fertility drugs, the odds of having quadruplets are about 1 in nearly 572,000, experts said.