Thankful Victorians share ambo stories

A mother who gave birth prematurely at home and a boy born on a freeway are just two of hundreds giving thanks on Victoria's inaugural "Thank a Paramedic Day".

The hashtag #ThanksAmbos began trending on Tuesday afternoon as grateful Victorians shared their messages and stories with the paramedics who answered calls for help.

Colleen Costante was home alone 18 months ago when surprised by the birth of son Lucas at 25 weeks.

She was reunited on Tuesday with paramedic Daniel Korsak, who attended in the minutes after Colleen's frantic triple zero call.

"I've had my baby early and I don't have anyone - 26, almost 26 weeks and it's crying - but no one's here," Ms Costante said in the call.

Lucas stopped breathing and was rushed to hospital by the first responding ambulance.

"It's the kind of job we're all prepared for but never want to attend," Mr Korsak said.

"It's not often we get the opportunity to follow up with many of the cases we go to ... and it's nice to see him and the whole family thrive."

Nine-year-old Marcus Necovska, who was delivered in an ambulance hurtling down the Tullamarine Freeway, used his reunion with paramedics Marc Zelek and Libby Langdon to share his wish to become a paramedic himself.

Ambulance Victoria acting CEO Tony Walker said the day reminded paramedics of how much they are appreciated.

"To actually meet the families they helped ... is an incredible boost to them and makes the difficult days better for them," Mr Walker said.