Large Sunglasses

I was on the bus the other day and there was an infant and it's mother sitting in front of me. I was wearing large sunglasses and discovered that the baby's lack of object permanence could be played with simply by taking my glasses on and off. The mother was also wearing large sunglasses and I realized that the baby might be less connected to the mother while wearing sunglasses because it was no longer a person that the infant recognized. Although I was unable to gather much hard evidence, I think it is probably a good idea for mothers to avoid fashion that obscures the face so as to maintain a stronger connection with the infant, at least until a certain age.