There are at this time 112 comments on this page. I searched for "emotion" and got zero hits, and only one comment mentioned "bonding." A problem with any scientific assessment of the human condition is the narrow focus, and these studies only take into account a few variables out of thousands.

Emotional bonding between mother and child is a huge factor in breastfeeding -- that's common sense that doesn't require scientific validation, although it would be very interesting to see studies from that perspective.