When do you think babies start to "recognize" their caregivers?

Your text presents info about face recognition being "special".
This is reinforced by the YouTube video on face recognition in infants. In an evolutionary sense, why would it be important for us to have this "special" perceptual process, even at an infant stage?

If you have been around (or have) babies, have you noticed this interest in faces, as shown in the video clip?

Most parents like to believe that their newborns can recognize them immeidately after birth, which is not likely based on the neural development of newborns (but it apparently makes parents feel better - I'm not a parent and have not been around kids). When do you think babies start to "recognize" their caregivers? Meaning that they know mamma, daddy, grandma as being different from a newcomer or stranger.