When Bilingual Infants look at people talking

"Have you ever observed infants raised in a two-language home when they look at someone speaking to them? I have had that opportunity lately and what has struck me is both the intensity of their gaze and the attention they pay to the mouth, but also to the eyes, of the speaker. But is this simply a figment of my imagination, or is there some truth to it?"
www.psychologytoday.com/blog/life-bilingual/201509/when-bilingual-infants-look-people-talking