Tom was diagnosed at four and a half weeks old, and had surgery called Kasai a week later, which involved taking a piece of intestine to create a new bile tract from his liver.
"If he had the surgery a month later he could have died, or required a liver transplant," she said.
"We're just wanting to raise awareness and to give parents the confidence to seek help or a second opinion if their young child has jaundice."
After Tom's diagnosis there were six more hospital stays in both Starship and Whangarei hospitals, but these days he lives a relatively normal life, Mrs Brown said.
"Overall Tom has grown well and life has gradually become more normal. We see specialists every six months or so, and get scans annually, but otherwise he wouldn't see the doctor any more than any other child."
He enjoys mountain biking, duck-shooting, surfing and going bush, she said.
"His three scars, from his initial liver biopsy, his Kasai and his bowel surgery, are the only outward reminders of his challenging start to life."