It turns out some people can donate blood for babies because they are CMV negative, having never been exposed to the Cytomegalovirus (CMV).
This is important because the an infection from CMV for a low birth weight infant may be severe or even fatal.
Being O- my blood can also be given to anyone.
I didn't know all this paediatric stuff as I waited for the machine to beep, signaling the end of my contribution. But I did see my wife begin to cry.
Days later, baby Flynn arrived at last. He didn't need a transfusion but my wife - a midwife as it happens - knows I'm doing my bit when newborns start out with the odds stacked heavily against them.
I've told the other kids I have "dragon's blood". With the right roll of the genetic dice and luck in life, they will also.
How to donate
Visit the NZ Blood Service website for a list of donor sites and to see whether you are eligible
- Edward Rooney is regional news editor for NZME.