Age 2 Months - Developmental Milestones
- Holds Head Up, But Unsteady
 - Moves Both Arms and Both Legs
 - Opens Hands Briefly
 - Tracks Objects to the Midline
 - Produces Sounds Aside from Crying
 - Reacts to Loud Noise
 - Social Smile
 - Recognizes Parents
 - Soothed When Spoken to or Picked Up
 
Age 4 Months - Developmental Milestones
- Keeps Head Steady Without Support
 - Pushes Up on Elbows While on Tummy
 - Holds a Toy in Hands
 - Moves Hands Towards Mouth
 - Cooing
 - Turns to Voice
 - Chuckles
 - Enjoys Looking Around
 - Looks at Hands With Interest
 - Opens Mouth When Hungry
 
Age 6 Months - Developmental Milestones
- Sits Propped Up On Hands
 - Rolls
 - Raking Grasp
 - Makes Squealing Noises
 - Blows "Raspberries"
 - Turn-Taking in Sounds
 - Laughs
 - Enjoys Looking at Self in a Mirror
 - Recognizes Familiar People
 - Closes Lips to Signal Fullness
 - Puts Objects in Mouth
 - Reaches for Desired Toys
 
Age 9 Months - Developmental Milestones
- Sits Up Independently
 - Transfers Objects Between Hands
 - Uses Fingers to Pull Food Toward Self
 - Produces Various Sounds Like "mamamama" and "bababababa"
 - Raises Arms to be Lifted Up
 - Separation Anxiety
 - Shows Facial Expressions
 - Looks When Calling Name
 - Smiles or Laughs at Peek-a-boo
 - Looks for Dropped Objects Out of Sight
 - Bangs Two Items Together
 
Age 1 Year - Developmental Milestones
- Pulls Up to Stand
 - First Steps
 - Drinks From an Open Cup with Assistance
 - Two-Finger Pincer Grasp
 - Understands “No”
 - Waves "Bye-Bye"
 - "Mama & Dada"
 - Plays Pat-A-Cake
 - Puts Block in Cup
 - Searches for Hidden Toys
 
Age 18 Months - Developmental Milestones
- Walks Independently
 - Climbs On/Off Furniture Without Help
 - Drinks from Open Cup Independently
 - Scribbles
 - Eats  with Fingers
 - Tries to Use a Spoon
 - Stacks Three Blocks
 - Attempts Three-word Phrases
 - Follows One-step Commands
 - Checks While Moving Away
 - Points to Objects
 - Engages With Toys Simply
 - Copies Parent Doing Chores
 - Extends Hands for Washing
 
Age 2 Years - Developmental Milestones
- Kicks a Ball
 - Runs
 - Walks Up Stairs With Help
 - Stacks Six Blocks
 - Feeds Self With a Spoon
 - Two-Word Phrases
 - Points to Book Items as Prompted
 - Demonstrates Varied Gestures
 - Identifies Body Parts When Prompted
 - Shows Empathy
 - Holds and Manipulates Objects Simultaneously
 - Engages With Multiple Toys
 
Age 3 Years - Developmental Milestones
- Starts Dressing Independently
 - Rides Tricycle
 - Stack Nine Block Tower
 - Threads Items Together
 - Copies Circle
 - Uses Fork
 - Engages in Two-way Conversation
 - 75% Speech Understood by Stranger
 - Says First Name
 - Avoids Hot Objects When Warned
 - Joins Other Kids in Play
 
Age 4 Years - Developmental Milestones
- Unbuttons Some Buttons
 - Catches a Large Ball
 - Serves Food or Pours Water With Help
 - Copies Line, Circle, Stick Figure
 - 100% Speech Understandable
 - Identifies Colors
 - Cooperative Play
 - Imaginary Friends
 - Likes Being a “Helper”
 - Avoids Danger
 
Age 5 Years - Developmental Milestones
- Buttons Some Buttons
 - Hops on One Foot
 - Prints Letters
 - Counts to 10
 - Uses Simple Rhymes
 - >3 Back-and-forth Exchanges
 - Answers Simple Questions
 - Tells a Story
 - Names Some Letters When Pointed
 - Follows Rules
 - Sings, Dances, Acts
 - Does Simple Chores
 
Psychosexual Stages of Development (Overview)
- Oral Stage
 - Anal Stage
 - Phallic Stage
 - Latency Stage 
 - Genital Stage
 
Psychosexual Stages of Development - Oral Stage
- Birth to 18 Months
 - Oral Fixation
 
Psychosexual Stages of Development - Anal Stage
- 2 to 4 Years
 - Anal-retentive Fixation
 - Anal-expulsive Fixation
 
Psychosexual Stages of Development - Phallic Stage
- 3 to 6 Years
 - Oedipus Complex
 - Castration Fear
 - Phallic Fixation - Male
 - Electra Complex 
 - Penis Envy
 - Phallic Fixation - Female
 
Psychosexual Stages of Development - Latency Stage
- 6 to 11 Years
 - Disgust Towards Opposite Sex
 - Latency Fixation
 
Psychosexual Stages of Development - Genital Stage
- Puberty to Death
 - Ability to Love Another Person
 
Erikson’s Theory of Psychosocial Development - Stage 1 (Infancy)
- Infancy (Birth to 18 months)
 - Trust vs. Mistrust
 - Feeding
 - Hope
 - Oral
 
Erikson’s Theory of Psychosocial Development - Stage 2 (Toddler)
- Toddler (1-3 Years)
 - Autonomy vs. Shame and Doubt
 - Toilet Training
 - Will
 - Anal
 
Erikson’s Theory Of Psychosocial Development - Stage 3 (Preschool Age)
- Preschool (3-5 Years)
 - Initiative vs. Guilt
 - Exploration
 - Purpose
 - Phallic
 
Erikson’s Theory Of Psychosocial Development - Stage 4 (School Age)
- School Age (6-12 Years)
 - Industry vs. Inferiority
 - School
 - Competence
 - Latency
 
Erikson’s Theory Of Psychosocial Development - Stage 5 (Adolescence)
- Adolescent (12-18 Years)
 - Identity vs. Role Confusion
 - Social Relationships
 - Fidelity
 - Genital
 
Erikson’s Theory Of Psychosocial Development - Stage 6 (Young Adulthood)
- Young Adult (20-30 Years)
 - Intimacy vs. Isolation
 - Romantic Relationships
 - Love
 
Erikson’s Theory Of Psychosocial Development - Stage 7 (Adulthood)
- Adulthood (Age 30 - 65 Years)
 - Generativity vs. Stagnation
 - Career & Parenthood
 - Care
 
Erikson’s Theory Of Psychosocial Development - Stage 8 (Older Adult)
- Older Adult (65+ to Death)
 - Integrity vs. Despair
 - Reflection on Life
 - Wisdom
 
Piaget's Stages of Cognitive Development
- Sensorimotor (Birth to 2 years)
 - Preoperational (2 to 7 years)
 - Concrete Operational (7 to 11 years)
 - Formal Operational (11 years and up)