A second person has been arrested by Gardai investigating yesterday's shooting in Mulhuddart.
An eight-month old baby, his mother and a teenager were injured in what's understood to be a family dispute in Parslickstown Gardens.
A 23-year-old woman was arrested in the Wicklow area this evening, a day after the arrest of a man in his forties.
All three victims are being treated in hospital for injuries that Gardai say are not life-threatening.
Superintendent Liam Carolan says Gardai were called to the scene at around 12:30 yesterday afternoon.
"We're having conflicting versions of events, but clearly with that damage it would have been quite close range", he said.
Anyone who has information that can help investigating officers is being asked to contact Blanchardstown Garda Station.