As his dad bounces around his favourite Big Bird soft toy, a smile flashes across the face of 2-year-old William Burton.
He's smiling more now, and doctors think his eyes react to light as well.
The Wellington boy was left quadriplegic and severely brain damaged after the city's hospital twice failed to diagnose E. coli meningitis in 2013.
Doctors then told William's parents Derek and Wendy he wouldn't be put on life support if he required it - an effective death sentence if William got badly sick.
The Burtons last spoke to the Herald six months ago, shortly after receiving that news. But since then William has made slow and steady progress and hasn't been in hospital since early August. And Mr Burton said his son, who will be 3 in July, has been "growing like a weed".