Which milestone is expected for a 2‑month‑old infant regarding social development?

• A. Smiles socially
• B. Brings hands to mouth
• C. Smiles in response to human face
• D. Sits up without support

Answer: (C)

Understanding social development milestones in infancy helps you recognize how interaction with caregivers emerges. By about two months, babies typically show a social smile—smiling in response to a human face. This reflexive-turned-deliberate smile signals growing social engagement and early communication, as the infant uses their expression to interact with caregivers.

Other options reflect non-social or later developments: bringing hands to the mouth is a motor behavior, and sitting up without support occurs much later, around six months. So the two-month social milestone best described is smiling in response to a human face.