a. Cognitive Development: This domain involves the development of thinking, problem-solving, and memory skills. Milestones include recognizing familiar faces at 3 months, sorting shapes and colors at 2 years, and understanding the concept of time at 5 years. b. Communication Development: This domain involves the development of language and communication skills. Milestones include cooing and babbling at 3-6 months, using simple sentences at 2 years, and understanding complex instructions at 5 years. c. Emotional Development: This domain involves the development of self-awareness, self-regulation, and emotional understanding. Milestones include smiling at familiar faces at 3 months, showing a range of emotions at 2 years, and understanding complex emotions at 5 years. d. Physical Development: This domain involves the development of gross and fine motor skills. Milestones include holding head up at 3 months, walking at 1 year, and hopping, skipping, and jumping at 5 years. e. Social Development: This domain involves the development of social skills and understanding. Milestones include recognizing familiar people at 3 months, playing alongside others at 2 years, and understanding friendship at 5 years. Multiple development domains are linked as they influence each other. For example, physical development can impact cognitive development as children explore their environment