(( I feel like this one doesn't explain as well as the other ones did...so I will try to like give a better explaination in the description *coughandshortertoololcough* ; v ;
-Okay, so baby MPs look like this [link]
-And stay like that until their first birthday and then they look like that example baby up there lol
-Newborns only have the sense of touch so when the doctor likes hands the baby to the mother that's the first person that they recognize, especially when the mother is the primary care giver.
-Because the mother who is the main person caring for the baby she is also the main one touching the baby, so the baby is like "Okay this person is always picking me up and taking care of me so this must be mom". Cuz...baby logic lol.
-So then when then finally get all there other senses and they match this new face and voice with that familiar touch they're like "Omg dis is mom! This is the same person who has been caring for me". ))