A 49-year-old US woman has given birth to her grandson after her daughter was precluded from becoming pregnant because of a heart condition.

The Portland Press Herald newspaper in Maine reported that Linda Sirois gave birth on August 13 for her daughter, Angel.

Twenty-five-year-old Angel Hebert, from Maine, says her baby is "eating like a champ and he doesn't fuss too much".

Ms Sirois said she has offered for years to become a gestational surrogate for Angel if a doctor said she should not become pregnant. Mrs Hebert says she and husband Brian Hebert got that word last summer.

Ms Sirois has four children, including twins, and her youngest kids are in college.

She says she thinks this pregnancy might have been her easiest.