Infancy
* Newborn (0-1 month): Rapid physical development, establishing basic reflexes, learning to feed and sleep.
* Early Infancy (1-4 months): Developing motor skills, social smiles, cooing and babbling.
* Middle Infancy (4-8 months): Sitting up, rolling over, grabbing objects, experimenting with sounds, recognizing familiar faces.
* Late Infancy (8-12 months): Crawling, standing, first words, separation anxiety, beginning to understand object permanence.
Childhood
* Toddlerhood (1-3 years): Walking, talking, developing language skills, exploring their environment, developing independence, starting to understand basic social rules.
* Preschool (3-5 years): Fine motor skills develop, imagination blossoms, playing pretend, starting to understand numbers, letters, and colors, learning social skills and self-regulation.
* Early Childhood (5-8 years): Developing reading and writing skills, learning math concepts, starting to understand complex social situations, building friendships, developing hobbies and interests.
* Middle Childhood (8-12 years): Reasoning skills improve, forming close friendships, developing self-esteem, becoming more independent, starting puberty.
Note: These are just general guidelines and every child develops at their own pace.
It's also important to note that there are other ways to categorize these stages based on different developmental milestones (like cognitive, social-emotional, or physical) or different theoretical frameworks (like Piaget's stages of cognitive development).
Do you have a specific area of development or a particular theory you're interested in exploring further?