Dalenberg said Tuesday on ABC's "Good Morning America" that she was happy to serve as a surrogate to help her daughter.
The girls were delivered by Caesarean section on Oct. 11. They were more than two months premature and each weighed less than three pounds.
Daughter Kim Coseno says the babies are doing well.
The Cleveland Clinic says Dalenberg offered herself as a surrogate when Kim Coseno and her husband, Joe, were waiting to adopt. The couple used in vitro fertilization, and embryos were implanted in Dalenberg's uterus.