What timing is critical for observing developmental milestones in infants?

The critical timing for observing developmental milestones in infants is indeed between birth and 12 months. This period is marked by rapid growth and significant changes in physical, cognitive, social, and emotional development. During these first twelve months, infants typically achieve key milestones such as rolling over, sitting up, crawling, and beginning to walk. Additionally, they start to develop crucial social skills, such as smiling socially and engaging in simple interactions with caregivers.

Monitoring development during this stage is essential because early identification of any delays or concerns can lead to timely interventions. Behaviors such as responding to their name, making sounds, or showing preferences can provide vital insights into an infant's development. This focus on the first year allows caregivers and healthcare providers to understand and support the natural progression of development and ensure that infants are reaching these important early milestones.