A Central Pulse spokeswoman said it was a tragedy for the Wiffen family.
Wiffen had a newborn as well as another child, she said.
She was well-known to many of the players despite not appearing on the court for the team for a couple of years, commentating on the sidelines and socialising with the team members.
"Our thoughts are with Daya and her family in what must be a very, very difficult time," she said.
Otaki Community Board chairman James Cootes said the community were thinking of the family.
"The loss of a young one is a tragedy for all the family and whanau involved and our thoughts are with them at this time."
He said out of respect for the family, who he knew personally, he did not want to comment further.
A death notice for Remy Stirling Wiffen says he was a "treasured and adored son" of Daya and Sam Wiffen.
His funeral service will be held at Nga Purapura on Tasman Rd, Otaki, on Friday.
PIC Netball Club has posted a tribute on its Facebook page about Remy's death.
The club will be in attendance at the funeral, wearing uniforms, to support the family.
"We extend our love, prayers & healing to the Pritchard & Wiffen whanau during this very difficult time," it said.
"Please keep the [family] in your thoughts and prayers."
Otaki councillor Penny Gaylor said there was an "incredibly sad" feeling throughout the community.
"The whole community is absolutely grieving for the family and the friends.
"It's a strong community. We're a family full of families," she said.
