Explore the stages of physical, cognitive, social, and emotional development.

Physical Development:
1. Infancy (0-2 years): During this stage, infants rapidly grow and develop motor skills such as crawling, walking, and grasping objects. They also develop their senses and coordination.
2. Early Childhood (2-6 years): Children continue to grow and develop fine and gross motor skills. They become more independent in their movements and begin to develop hand-eye coordination.
3. Middle Childhood (6-12 years): Children continue to grow and develop physically, with a focus on refining their motor skills and coordination. They may also experience growth spurts and changes in body composition.
4. Adolescence (12-18 years): Adolescents experience rapid physical growth and development, including puberty and sexual maturation. They may also develop more muscle mass and experience changes in body shape.

Cognitive Development:
1. Sensorimotor Stage (0-2 years): Infants learn about the world through their senses and actions. They develop object permanence and begin to understand cause and effect.
2. Preoperational Stage (2-7 years): Children begin to use language and symbols to represent objects and ideas. They also develop egocentrism and have difficulty understanding the perspectives of others.
3. Concrete Operational Stage (7-11 years): Children begin to think logically and understand concepts such as conservation and reversibility. They also develop the ability to understand the perspectives of others.
4. Formal Operational Stage (11+ years): Adolescents develop the ability to think abstractly and hypothetically. They can solve complex problems and think about future possibilities.

Social Development:
1. Infancy and Early Childhood: Children begin to form attachments to caregivers and develop trust. They also start to interact with peers and learn social skills such as sharing and taking turns.
2. Middle Childhood: Children develop more complex social relationships with peers and begin to understand social norms and rules. They may also start to develop a sense of identity and self-esteem.
3. Adolescence: Adolescents begin to form more intimate relationships with peers and develop a sense of identity separate from their parents. They may also start to explore their values and beliefs.

Emotional Development:
1. Infancy: Infants begin to develop basic emotions such as joy, sadness, and fear. They also start to form attachments to caregivers and learn to regulate their emotions.
2. Early Childhood: Children continue to develop emotional regulation skills and begin to understand and express a wider range of emotions. They also start to develop empathy and understand the emotions of others.
3. Middle Childhood: Children become more aware of their own emotions and the emotions of others. They may also start to develop coping strategies for dealing with stress and difficult emotions.
4. Adolescence: Adolescents experience a wide range of emotions as they navigate the challenges of puberty and developing independence. They may also start to develop a sense of identity and explore their values and beliefs.

Physical Development

- Infancy (0-1 year): Rapid growth in height, weight, and head circumference; motor skills develop rapidly (rolling over, sitting up, crawling, walking)
- Toddlerhood (1-3 years): Continued growth, but at a slower pace; motor skills become more refined (running, climbing, jumping); toilet training begins
- Preschool (3-5 years): Growth stabilizes; fine motor skills continue to improve (drawing, writing, cutting); coordination develops
- School age (6-12 years): Further growth in height and weight; physical activity becomes more important; hand-eye coordination improves
- Adolescence (12-18 years): Rapid growth spurt; development of secondary sexual characteristics; physical maturity reached

Cognitive Development

- Infancy (0-1 year): Development of object permanence, memory, and language comprehension
- Toddlerhood (1-3 years): Egocentric thinking; use of simple language; imagination and creativity flourish
- Preschool (3-5 years): Preoperational thought; use of symbols and pretend play; understanding of conservation concepts
- School age (6-12 years): Concrete operational thought; logical reasoning; ability to understand cause-and-effect relationships
- Adolescence (12-18 years): Formal operational thought; abstract reasoning; development of a personal identity

Social Development

- Infancy (0-1 year): Development of attachment to caregivers; social smiles and gestures
- Toddlerhood (1-3 years): Development of self-awareness; parallel play; formation of friendships
- Preschool (3-5 years): Cooperative play; development of social skills; negotiation and compromise
- School age (6-12 years): Peer groups become more important; development of social hierarchies; ability to resolve conflicts
- Adolescence (12-18 years): Development of romantic relationships; search for identity and independence; increased social awareness

Emotional Development

- Infancy (0-1 year): Expression of basic emotions (joy, sadness, anger, fear)
- Toddlerhood (1-3 years): Development of self-regulation; tantrums and mood swings common
- Preschool (3-5 years): Complex emotions (guilt, shame, envy) emerge; ability to understand and empathize with others
- School age (6-12 years): Emotional stability improves; development of coping mechanisms
- Adolescence (12-18 years): Increased emotional intensity; mood swings; development of self-esteem and identity