This document discusses the physical, cognitive, linguistic, social, and emotional milestones that occur around 7-9 months of age. Key developments include: - Sucking and rooting reflexes disappear, while parachute reflex appears as babies begin to grab objects. Teething of upper and lower central incisors also typically occurs. - Physically, babies can sit with support, lift their head while on their stomach, control their trunk better, and bounce when held standing. - Cognitively, they can hold toys and transfer objects between hands, imitate actions, and use raking motions. They also develop taste preferences. - Linguistically, babies can recognize their