Developmental Stages: Infancy to Adolescents Practice Test

Gross motor development begins with establishing head and neck control, which provides the foundation for all later movement. The earliest milestone among typical patterns is head control, usually achieved around 1 to 3 months. This reflects the infant’s developing neck and upper-trunk muscles and the ability to stabilize the head in prone or supported positions. Once head control is established, babies build further skills: sitting without support comes later (roughly 6–8 months) as trunk and balance improve, crawling follows (about 7–10 months), and walking arrives even later (around 12–15 months). Individual variation exists, but this sequence shows why head control is the earliest milestone.