Which item is listed as a 7-9 month milestone?

• A. Differentiates between familiar or unfamiliar people
• B. Initiates social games
• C. Uses gestures
• D. Enjoys social games

Answer: (A)

At 7-9 months, babies start to recognize who is familiar and who is not, showing clear preference for caregivers and a sense of stranger danger. This differentiation reflects growing memory and attachment, as well as the brain’s developing ability to read social cues. It marks a specific shift in social cognition: moving from broadly engaging with people to selectively responding to those who are close to them.

That makes the item about differentiating between familiar and unfamiliar people the best fit for a 7-9 month milestone. Other social behaviors—like initiating social games, using gestures, or enjoying social games—usually appear a bit later, as infants’ social repertoire expands with experience and motor development.