Proud dad Paul, who works with the Airport Police, said that it was an incredible lucky omen that his wife delivered the child on their anniversary.
But he never dreamed on his wedding day in 2000 that he would have his own 'Maher's dozen'.
"I never thought about it," he laughed. "I gave Edel her anniversary present on Wednesday evening because I thought she wouldn't be around for the date.
"Eleven years married and the 11th child born on the day," he said. "I think it's a good omen."
There's a big gap between eldest Eoin (12) and his brother Cian (9) but after that the boys are close in age with Darragh (8), Cathal (7), Conor (5) and twins Odhran and Oisin (4) and Fionn (3).
The Mahers were delighted when they had Aisling who is now aged two, as well as one-year-old Cillian.
Only-girl Aisling's dreams have come true as she finally has a little sister to play among the band of brothers.
"We never thought we were going to get a second girl," Paul said. "Edel always loved the names Aisling and Sadbh. The name Bernie meant something to Edel.
"Unfortunately her aunt died two days ago -- her name was Bernie.
"So it had a special significance to us."
They are thankful that Edel (37) herself is healthy, despite a sudden scare late on in her tenth pregnancy.
"Edel was quite ill herself -- she had pre-eclampsia and was kept in hospital overnight a couple of times," Paul said. "She had high blood pressure so they wanted to keep an eye on her."
Bursting with joy, dad Paul who works in Dublin Airport is delighted that baby number 11 has been sleeping soundly through the day.
"She's a great sleeper -- we've had one or two criers so we're delighted," he said.
"And once you have one, it can set the others off."
The couple who live in Carrickmacross, Co Monaghan, are planning to take it easy over the weekend to take stock of their enlarged family.