He was in the thick of it, joining councillors at Mayor Bill Dalton's home after the public vote against local bodies' amalgamation was revealed on September 15, and was at his first full council meeting when the city's annual plan was adopted the next day.
Mrs Brosnan, who turns 28 next month, has even had to yield to the ambitious baby, who has been the youngest at the table.
Tony Jeffery, in his 13th year on the council, told Hawke's Bay Today: "We're quite excited. We've adopted him. He's the 13th councillor.
"He's more than welcome," Mr Jeffery said. "He's quieter than a lot of the councillors. It was great."
Baby Daniel is the first grandchild for the parents of Annette and Greg. The couple met when she was 15.
"So, he's being very spoiled," she said of her son.
Among the shower of gifts has been a rubber duck, effectively another Daniel, in black and wearing No10.