The `White Flag` singer - who announced her pregnancy earlier this year - and her husband Rohan Gavin welcomed their boy, Stanley, into the world in the summer but decided not to publicly announce his arrival.
According to the Daily Mail newspaper, Dido - who celebrated her 40th birthday on 25.12.11 - gavebirth to Stanley at London`s exclusive Portland Hospital.
Before his birth, Dido said she wanted to find out the sex of her unborn baby and was really enjoying being pregnant.
She said: "I`m too curious. It`s enough of a surprise on the day.
"There`s a real calmness about being pregnant which I think is really nice. Your decisions are sort of made for you. You just have this priority that is unchangeable and I think that`s a great calmness that comes from that."
However, her pregnancy meant she missed out on the opportunity to perform her song `If I Rise` at February`s Oscars.
She wrote on her website at the time: "Hello everyone, It`s been a month of amazing news for me and now I have some more to share. Me and my husband Rohan are expecting a baby and we`re beyond happy and excited about it.
"So as some of you already know, I won`t be able to travel to LA for the Oscars ceremony to perform `If I Rise`.
"Obviously I`m really gutted about not being there - going to the Oscars has literally been a dream of mine since I was about nine."