Your baby's first year is when the foundation for lifelong coordination and balance is literally being built. During these 12 months, your little one naturally loses newborn reflexes like the startle reflex and gains new skills—from holding their head up to sitting and crawling. These movement milestones matter because they shape your child's physical development for life ahead. Tummy time, gentle movement, and watching for age-appropriate skills helps everything progress smoothly. Research suggests these early movement patterns follow generally consistent developmental patterns, and your pediatrician's developmental checklist remains a reliable guide. If you're concerned about your baby's progress, checking in with your pediatrician gives you clarity and reassurance.