Volume 3, Number 3, May/June Issue of AIR
Article:
"Maternal Spray Bonding," by Christina Linux
A photo-based appreciation of the acclaimed psychological mother-child
bonding technique.  "...mother supplies baby with milk, and baby, in turn,
sprays mother with fluids.  These fluids contain certain pheromones and
other chemicals that help mother recognize baby..."

I bring this article to your attention to give a possible different
perspective on the bonding issue.  I have not seen or read the article.