Infant Social Engagement Milestone

As a nurse working in a pediatric clinic, you are educating new parents about the developmental milestones of their infant during the first year of life. One key milestone occurs between the ages of 4 to 6 months. This is the time when infants typically begin to exhibit social smiles and may also start to engage in playful interactions such as laughing.

For your educational pamphlet, you want to complete the statement: By 4 to 6 months of age, infants will typically show social engagement through _____.