Are you my mommy?

Remember that book where the little chick or duck hatches out of its egg all alone? The newly hatched fowl then goes on a tour of the farm looking for its mother? "Are you my Mommy?" it asks all the various animals, before finally meeting up its mother. This, of course, goes against the much touted theory that newborn human babies all know their mother by smell. There is some study that newborns can distinguish their mothers by the scent of the breast milk, and will move towards the "correct" female body. There's also a study that indicated newborns can also recognize their mother's voice, since they've become familiar with the mother's voice from the womb. The support being that newborns will turn towards their mother's voice and be more easily soothed by it than any other sound. As a baby's eyesight is still all fuzzy and grainy, this reliance on the other senses is astounding.
In my opinion, this is all warm and fuzzy research designed to impart a sense of security to the new parent who is terrified of not being able to bond with their new baby. I further will theorize that the ability to recognize the mother's voice is probably a reflex that is soon lost as the child ages. (Like the Babinski and startle reflexes in newborns.) How else to explain why children no longer respond when you call their name or ask them to do something?
I'm also thinking that the eyesight thing might not improve that much. (Or maybe it's just my kids.) One hopes that your children will be able to recognize you by sight. I'm wondering about Aisling.
The other day, while flipping through a magazine, the kids came upon an advertisement featuring an Asian model. Aisling pointed to it, and said "Mama!".
And it's just not me that she has trouble distinguishing. A few nights, she picked up the book I had been reading. On the cover of the smutty romance novel, was a picture of a handsome, buffed male model with dark brown hair embracing a blond woman (yeah, yeah, one of those books - it's my one vice, okay!). Aisling points to the male and says "Daddy!".
When is it too soon to get a child's eyesight checked?
While laughing about this, I remembered when Devlin was about Aisling's age, he would point to any advertisement showing a hair covered arm, and say "Daddy!".