Camera crews and photographers braved the cold and rain outside St Thomas' Hospital on Tuesday to catch the first glimpse of Donald James Kennedy, son of Lib Dem leader Charles Kennedy and his wife Sarah.
The couple, who live in Kennington, emerged from the hospital just after 5pm and posed for the cameras.
Mr Kennedy said: "Sarah and myself are immensely grateful to all the clinicians, the midwives and all the staff who over these past nine months – but particularly over these last 30 momentous hours – have been so kind, so professional and so fantastically supportive. Really, from the bottom of our hearts, our thanks to them all.
"Secondly, can we say to all the family and friends who have been pouring in messages of support and goodwill, both here, at home in Scotland and across the river Thames here at national party headquarters at Cowley Street: we are immensely grateful for all the gifts, the kindnesses and expressions of goodwill – that really has been marvellous for us both.
The assembled press pack outside the hospital
The Kennedys were accompanied on their walkabout by community midwives Anna Byron and Melanie Denton.
Other visitors to St Thomas' were bemused by all the fuss. "Charles who?" was a frequently heard question. Julie Didd from Battersea, whose granddaughter Bethany Jane was born on the same ward on Tuesday afternoon, didn't think that the extra publicity for the Kennedys was likely to boost the Lib Dems' electoral chances. Mrs Didd said she would be voting Labour.
Between 1995 and 1998 Sarah Gurling was a councillor in Southwark and sat on the education and leisure committee. She is head of government relations for National Lottery operator Camelot plc.