The three-year-old has brought his parents, Jade and Rhys, and his younger brother Reuben, two, so much joy but without a life-saving liver and bowel transplant, they are terrified they will lose Zachary before the year is out.
Jade, 24, said: "A few weeks ago they said Zachary may not survive much longer, but he is here. He has a lot of health issues and spends more time in hospital than out of it. We really need the transplant to come urgently now.
"As parents, you never expect to be in this position and we are helpless. It's coming up to Christmas and we don't know if Zachary will be here."
Zachary is one of 280 children on the transplant list, hoping for the gift of life this Christmas.
The Mirror successfully campaigned to change the law on organ donation in England to an opt-out system.
But the families of the bereaved still have the final say.
Jade said: "We want to do anything we can to raise awareness of Zachary's story and all the children waiting. We hope someone else can save him because we're not able to."
Jade and Rhys found out at the 10-week scan that their baby had an abdominal defect, gastroschisis, which meant there was a hole in his stomach wall.
At 28 weeks, a scan revealed Zachary's bowel had perforated and he needed to be delivered urgently.
He then needed artificial feeding, which affected his liver, and his bowel was small following the surgery, which also made feeding a problem.
This story is from the {{IssueName}} edition of {{MagazineName}}.
Start your 7-day Magzter GOLD free trial to access thousands of curated premium stories, and 9,000+ magazines and newspapers.
Already a subscriber ? Sign In
This story is from the {{IssueName}} edition of {{MagazineName}}.
Start your 7-day Magzter GOLD free trial to access thousands of curated premium stories, and 9,000+ magazines and newspapers.
Already a subscriber? Sign In
WE'VE GOT A SLOT TO PLAY FOUR
Kop boss confident his rampant Reds can fight for the Quad... but insists contract wrangles won't be distraction
ANGE: EVEN SALAH WOULD STRUGGLE TO SHINE IN OUR TEAM
ANGE POSTECOGLOU believes even Mohamed Salah would struggle to be prolific in Tottenham’s current team.
How Forest are making a big noise in the title race
GIBBS-WHITE AND HIS 'NO REGRETS' ATTITUDE IS FIRING NUNO'S MEN
KNIGHTMARE
Scholes blasts Sir Jim: It's all gone downhill since he took over
LAST ROLL OF THE DYCHE
Toffees boss knows he's running out of time to deliver for new owners and says they are right to be reviewing his job
WIGAN WARRIOR
Brave Isa's on mend after horror ankle dislocation left him fearing he may never walk properly again
WE'LL BEAU FOR BROKE
Tammy fired up for big test Down Under
NORRIE SORRY
Brit star apologises after accidentally throwing racket into crowd
My life as witch a
The modern Molly Weasley who is using chat-brooms to work magic
Je suis Charlie..toujours
Tribute on atrocity's 10th anniversary