At what age range do infants typically begin saying their first word and sitting without support?

Infants typically begin to sit without support and say their first words between the ages of 9 to 12 months. At this stage of development, children not only achieve the milestone of sitting independently but also begin to engage in verbal communication.

During this period, their motor skills are advancing, allowing them to stabilize their posture and explore their surroundings more effectively. Additionally, cognitive and social development is taking place, which includes the ability to form connections between sounds and meanings. This coincides with the emergence of first words, often simple words like "mama" or "dada."

This age range marks a critical point in an infant's growth, where they refine their abilities to interact with others both physically and verbally. The combination of physical stability and emerging language skills is a hallmark of the developmental stage in this timeframe.