It's a phrase that we used when we had our first DC. A made up one. It's not something that I have ever heard anyone else use and we always said it in relation to our first DD.
Now one of his mates has had a baby and he put our phrase on the friends comments box under the photo of their baby.
I asked him why he'd done this..and he went mad as if I had picked on him for nothing. He said he never knew I'd be upset though he knew it was a phrase which had personal meaning and emotional attachment for me and for him.
I can't understand why he'd say that on stupid FB!! He barely comments on things usually!