Watching a child roll over, sit up, crawl, or take those first unsteady steps brings joy and pride to many parents and caregivers. These gross motor skills, which involve the large muscles of the body, mark important stages in early childhood development. Yet, when a child seems to lag behind peers, worry often follows. The truth is that development unfolds within a wide range, not a strict schedule. Knowing when to wait and when to seek help can make a big difference in supp