Babies all learn to talk at different rates. Very few of them can actually talk clearly at only three months of age, which is the age of the baby in this particular video. However, babies are absorbing all sorts of information all the time, and they tend to mimic the adults around them in learning how to speak.
The father in the video is holding up the baby and trying to clearly show the baby how to say ‘I love you.’ The baby tries to mouths the words as accurately as possible, which is certainly no easy task. However, the baby produces sounds that are close enough to the accurate expression that the video feels like an important recording of a baby’s speech attempts. People all over Facebook would adore this video, especially if they have children and if they’re keeping track of the milestones that their own kids are experiencing.