Police have issued an abduction alert after a seven-week-old baby was allegedly kidnapped by his father from a Canberra home.

It is allegd Garry Gorden snatched the baby from a house in O'Malley early today and may be heading interstate.

The 25-year-old is described as 193cm tall, 140kg, with short curly red hair.

He may be driving a 1993 grey Ford Falcon sedan with number plate YEB47J.

"Police hold grave concerns for the welfare of the baby and are asking for Gary to come forward to police," the Australian Federal Police said in a statement.

Anyone who sees the man is urged to call police on 131 444, but not to approach him.