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BOSTON (AP) _ Acting Gov. Jane Swift was released from the hospital Sunday, but her newborn twins will remain hospitalized for at least a day longer.

Lauren Alma and Sarah Jane, who were born Tuesday, were being held for observation after being treated for jaundice.

Swift spokesman Jason Kauppi said Sunday that the initial treatment was successful, but doctors wanted to keep the girls an extra day to make sure the problem does not recur.

``They're doing well,'' he said. ``If nothing changes, they will hopefully be released (Monday).''

Jaundice, a condition which gives the skin a yellowish tint, is a common problem among newborns and is treated by putting the infants under special fluorescent lights.

Swift, 36, became acting governor in April when predecessor Paul Cellucci became ambassador to Canada. She is the nation's youngest governor and first to give birth while in office.

Swift said she plans to return to her home in western Massachusetts once the babies are discharged and begin a ``working maternity leave.''