Three to four years: 500 new words; complete sentences
Four to five years: articulation nearly perfect; interest in rhyming
Five to six years: articulation perfect; inflection of nouns and verbs nearly perfect; interest in nonsense words; use of drawing
Six to nine years: grammar usually correct; interest in puns and in secret language; use of drawing as language expression; imitative interest in symbols of language (alphabet, reading, writing)
Nine to twelve years: genuine interest in language symbols; easily learns reading and writing; with limited vocabulary, slang develops
Physical and Mental Growth and Development
| Physical Characteristics | Birth | First Six Months | Second Six Months |
| Organs rapidly growing | Muscles, bones, brain, viscera | As first 6 months, and teeth | |
| Organs proportionately large | Head, surface, intestines, liver | Head, intestines, liver, surface | ” |
| Organs proportionately small | Stomach, lung capacity, legs | Stomach, lungs, heart, legs | ” |
| Organs proportionately strong in function | Anti-bodies, kidneys | ” | |
| Organs proportionately weak in function | Digestive and respiratory systems; tissues flabby | Digestive, respiratory, nervous systems; leucocytes, hemoglobin | ” |
| Dentition | No teeth (rudiments of both sets in jaw) | 2 teeth | 6-8 teeth |
| Nerves | Total number of cells but development incomplete | Easily exhausted; peripheral nerves sensitive; sensory and motor centers developing | As first six months; spinal and brain associations connecting |
| Sense development | No hearing; sight only for light and darkness; touch vague; sensitiveness to temperature | Hearing begins; eyes begin to converge and work together | Color sense, sound, rhythm developing |
| Special organs or systems at developmental stage, needing much immediate exercise | Lungs | Muscles of arms, legs, trunk, hand; lungs | As first 6 months; muscles of creeping, hand, speech organs |
| Defects easily acquired | Eyestrain; blindness | Bones misshaped; eyestrain; nerves; disposition | As first six months |
| Defects easily overcome | Phimosis temperament; | Bones; phimosis; tongue-tie, harelip | ” |
| Illness most susceptible | Cold, pneumonia, jaundice, inflammation of navel | Digestive, pulmonary; rickets; nervous disorders, erysipelas | ” |
| Most common immediate causes of death[2] | Congenital debility; syphilis; prematurity, accidents | Congenital debility, digestive disturbances, pneumonia, whooping cough, bronchitis, convulsions, measles, meningitis | ” |
| Nature and rate of mentality | Vague, indefinite, slow, groping | Slow, vague, diffused | More definite, alert, quickened |
| Motor activities | Chiefly reflex | Grasping, waving arms, hands; kicking; few vocal sounds | Sitting, creeping standing, prattle |
| Sense activity | Slight, vague | Touch, sight, hearing becoming active | Sight, touch, hearing, active |
| Attention | None | Begins in staring, handling | Listening, examining |
| Perception | ” | Dimly begins | Vague |
| Curiosity | ” | Begins, vague | Objects in reach, opening doors, pulling; exploring cupboards |
| Imitation | ” | Of moods and vocal sounds of adults | Mechanical, of vocal sounds, moods, facial expression |
| Memory | Slight | Faint, vague; motor | For familiar acts and faces, responses to his crying |
| Imagination | None | Glimmerings | Glimmerings |
| Reasoning | ” | Dawning, by association | By association, increasing |
| Social instincts | ” | Egoistic, strong; trustful, responsive to care | Trust, desire for companionship of adults |
| Sense of law | ” | Vaguely sensed, as association of cause and effect; and in rhythm of regular regimen | Developed through regular regimen and beginnings of obedience, especially to direct commands |
| Emotions | Slight, vague | Fear, sympathy, confidence, satisfaction, anger | Control weak but susceptible to training |
| Sense of humor | None | None; smiling begins | Shown in surprise, plays, laughing |
| Will | ” | Temperamental expression | Persistent; shown in temper |
| Religion | ” | Begins in trust, dependence | Human sympathy, confidence, obedience |
| Physical Characteristics | Second Year | Third Year | Fourth Year |
| Organs rapidly growing | Brain, teeth, muscles, bones, viscera | Trunk, brain, teeth | Upper arm, thigh; brain still increasing; bones |
| Organs proportionately large | Intestines, liver, kidneys, arteries, head, surface | As second year | As second year |
| Organs proportionately small | Legs, lungs, heart | ” | Lungs, legs, heart |
| Organs proportionately strong in function | Heart, fundamental muscles | As third year | |
| Organs proportionately weak in function | As first year | Eyes, hands, fingers, legs, nerves, digestive, respiratory | As third year |
| Dentition | 6 teeth cut | Completion of first set | |
| Nerves | Motor coördinations developing, association centers developing | Sensory-motor coördinations forming | Sensory keen, motor coördinations rapidly developing (fundamental) |
| Sense development | Hearing discriminate; touch becoming keen, sight definite, focused | Touch, muscular, sight, sound; increasing discrimination | Increasing keenness, discrimination |
| Special organs or systems at developmental stage, needing much immediate exercise | Muscles of walking, forearm, hand; speech, sight, touch, hearing; teeth | Trunk, back, arms, legs, hands, speech, senses, teeth, respiratory | Arms, legs, trunk; sensory-motor coördinations; sensory nerves; teeth; lungs |
| Defects easily acquired | Bones; teeth, speech, nerves, disposition | Bones, teeth, speech, nerves | Eyes, bones, speech, nerves, teeth |
| Defects easily overcome | Bones; cleft palate, temperament | Bones, teeth, speech, eyes | Eyes, bones, speech, teeth |
| Illness most susceptible to | Digestive, respiratory; ears, throat, nerves; scurvy, rickets | Digestive, respiratory; ears, throat, infectious fevers | Digestive, respiratory; measles, scarlet fever, whooping cough, colds |
| Most common immediate causes of death | Digestive disturbances, croup, pneumonia, diptheria, bronchitis, tuberculosis, measles, meningitis | Period of low death rate; pneumonia, tuberculosis, croup, diptheria, meningitis, scarlet fever | Low death rate; Pneumonia, diptheria, croup, tuberculosis, meningitis |
| Nature and rate of mentality | Gaining in definiteness, slow | Impulsive, flitting, slow | Active, slow |
| Motor activities | Alertness, but inefficient Runs, throws | Increasing coördination of legs, arms, eye, and hand | Quiet games preferred to active; dawdling; spontaneous |
| Sense activity | Keen, especially touch. Acquiring discrimination | Handling, listening; sight, touch, sound discrimination | At best, most active |
| Attention | Increasing | Flitting, concentration increased in doing | Voluntary—weak Involuntary—strong |
| Perception | Gaining clearness, definiteness | Still vague, but becoming definite | Still vague, improving |
| Curiosity | Insatiable; objects in environment | Varied; names; animals; mechanical processes | Insatiable |
| Imitation | Constant, of adult actions, voice | Adult actions, speech, moods | Chiefly adult occupations, less impulsive; literal |
| Memory | For names of things; emotions, simple movements | Verbal and motor good; emotions | Verbal, motor and emotional strong |
| Imagination | Slightly increasing | Concrete, vivid | Auditory and motor images more distinct than visual; concrete |
| Construction | Building | Persistent, for motor activity | For activity, immediate use |
| Reasoning | By association of experiences | By association of experiences | By association; ludicrous inferences; guessing period |
| Social instincts | Increasing sense of ownership | Social dependence on an adult; slight play with other children | Self-assertive; selfish; quarrels over property |
| Sense of law | Discerned in regularity of régime: in commands, rewards, punishments | Dim: susceptible to training; sense of ownership developing | Disorderliness; imaginative tales taken for lying |
| Emotions | Trust, fear, anger | Love, fear, anger easily stirred; little control | Easily aroused, keen; pity begins; imaginary fears |
| Sense of humor | In surprises, in tumbles | In grotesque situations, being caught, hiding | Persistent; crude; in grotesque |
| Will | Vacillating, temperamental | Little control | Unreasonable; persistent |
| Religion | Respect for parents, trust. Obedience to parents | Obedience, trust, respect for authority | Animistic; invests inanimate things with life |
| Physical Characteristics | Fifth Year | Sixth Year | Later Childhood 6-9 years |
| Organs rapidly growing | See 4th year | Legs, arms, chest girth | Motor cells in brain. Period of slower physical growth; cessation of rapid brain growth |
| Organs proportionately large | Surface, intestines, kidneys, arteries | As 5th year | Digestive system, liver, kidneys, surface, legs |
| Organs proportionally small | As 4th year | As 4th year | Trunk, heart, lungs |
| Organs proportionately strong in function | Digestive and respiratory ability increasing | Digestive and respiratory ability increasing | Leg muscles |
| Organs proportionally weak in function | Accessory muscles and nerves; eyes, fingers, throat | As 5th year | Heart; low blood pressure; teeth |
| Dentition | Sheds some first teeth | 2nd dentition | |
| Nerves | Association fibres rapidly developing; see 4th year | As 5th year | Rapid growth of association fibres in brain; easily fatigued in 8th year |
| Sense Development | Keen development | Senses correlated; finer discrimination | Eyes developed for finer work |
| Special organs or systems at developmental stage, needing much immediate exercise | As 4th year | As 4th year | Muscles of arms, legs, trunk Muscles of forearm, 8 years. Muscles of fingers, 9-10 years |
| Defects easily acquired | ” | ” | Spinal curvature, defective teeth speech disorders, eyestrain |
| Defects easily overcome | ” | ” | Speech disorders |
| Illness most susceptible | Digestive, respiratory, ears, diphtheria, rheumatism, measles, scarlet fever | As fifth year | Infectious diseases, rheumatism, nervousness, anemia, digestive disturbances; illness increases 8th year |
| Most common immediate causes of death | Period of low death rate As 4th year | Period of low death rate As 4th year | Low mortality; pneumonia, tuberculosis, diphtheria, croup, measles, kidney and heart disease |
| Nature and rate of mentality | Steadier, quicker, more alert | More definite, alert, quicker | Hesitating, impulsive, restless |
| Motor activities | Increasing coördinations, rhythmic movements, skipping | Increasing correlation. Steadier action, marching, dancing | Finger movements stronger, more precise; actions not well coördinated |
| Sense activity | Finer discriminations; notices sound, color | Improvising on piano; eagerness to color; tasting | Senses become practically perfected; sensory interest weaker |
| Attention | Voluntary—weak; involuntary-strong | Purposive inattention; keener concentration in play | Flitting; lack of endurance, application |
| Perception | Clearer, many groups | Clearer | Truer to realities, more distinct; differentiates between real and imagined |
| Curiosity | Intense (see 4th year) | Physical properties; processes; causes; birth | Asks “What is it for?” Wider range of interests |
| Imitation | Dramatic, of adult activities, animals; literal | Dramatic; adults’ activities, animals; less literal | Decreasing, imitates idea rather than action |
| Memory | Verbal, strong; learns nonsense, poetry | Verbal, strong; poetry, stories; motor, emotional, strong | Literal, increasing in ability |
| Imagination | Strong visual, lives in imagination; invents stories | As 5th year; fanciful tales of personal experience | Less fanciful; related more to facts and needs of life |
| Construction | Follows idea; for activity, use, æsthetic interest | Things for use; æsthetic interest | Begins to be creative; interest begins in finish, workmanship |
| Reasoning | See 4th year, reasons by analogy; attempts arguing | As 5th year | Little use for explanations or logic |
| Social instincts | Prefers child to adult; love of emulation; selfish; ownership | Self-sufficiency; homesickness; begins group play | Group play, circle games; slight respect for property rights |
| Sense of law | No sense of property rights; disobedience increases | As 5th year. Increasing; rigid, literal | Expects to be held to law and consequences; respects power that requires obedience |
| Emotions | See 4th year; jealousy; fears animals; imaginary fears | Degree of control | Increasing control, reserve |
| Sense of humor | See 4th year. Drawings, practical jokes | As 5th year. Silliness | Incongruities of action; play on words; disasters |
| Will | Increasing force | As 5th year | Vacillating |
| Religion | Wonder in nature; reverence; prayer; obedience | As 5th year; imitative interest in formal worship | Period of ceremony, forms, rites Animistic tendency weakening |
| Physical Characteristics | Youth Girls, 9-12 years Boys, 9-13 years | Early Adolescence Girls 12-16 years Boys 13-18 years |
| Height | Slow growth; girls more rapid than boys | Rapid increase (Girls, 11-14) (Boys, 13-17) |
| Weight | Slow growth | Rapid increase ” ” |
| Organs rapidly growing | Legs, arms | Trunk, legs, arms, lungs, reproductive organs, heart, liver, kidneys; proportions changing |
| Organs proportionately large | Arteries | Hands, feet, arms, legs |
| Organs proportionately small | Heart, trunk arteries | Trunk, internal organs, |
| Organs proportionately strong in function | Muscles, legs, eyes | Heart, lungs; blood pressure high; muscles, fundamental and accessory |
| Organs proportionately weak in function | Heart, lungs; blood pressure; elimination | Nerves; internal organs, elimination; motor coördinations because of change in bodily proportions |
| Dentition | Complete (except wisdom teeth) | |
| Nerves | Reactions vigorous | Under strain; easily unbalanced |
| Sense development | Complete, including eyes | Senses keen |
| Special organs or systems at developmental stage, needing much immediate exercise | Muscles of trunk, forearm, fingers; motor adjustments; lungs | Muscles of trunk, arms, legs, fingers; lungs |
| Defects easily acquired | Spinal curvature, eyestrain; precocious sex development | Of reproductive system; shallow breathing |
| Defects easily overcome | Bones, teeth | Bones, lung capacity |
| Illness most susceptible | Anemia, rheumatism, heart weakness, nervousness; period of low morbidity | Anemia, nervousness, malnutrition; tuberculosis (girls); increased morbidity |
| Most common immediate causes of death | Period of low mortality. Pneumonia, tuberculosis, diphtheria and croup, heart and kidney diseases, accidental drownings | Pneumonia, tuberculosis, kidney and heart disease, accidental drownings |
| Nature and rate of mentality | Direct, alert; more orderly, controlled | Well coördinated, more abstract, logical, comprehensive; routine irksome |
| Motor activities | Well coördinated; need much exercise; new adjustments readily made | Muscular awkwardness during growth |
| Sense activity | Sure, acute, subordinate to thought | Acute; all senses |
| Attention | Voluntary increasing | Potential voluntary attention strong |
| Perception | Clearer | Clear |
| Curiosity | Less keen | Wide range; persistent; craving for larger experience |
| Imitation | Less marked; of idea rather than action | Of ideals, strong; originality marked; individuality |
| Memory | Quick, sure, lasting; period of rote learning | At best; logical |
| Imagination | Clear, creative | Vivid, comprehensive, creative; works for remote ends |
| Construction | Constructs for purpose; interest in workmanship, skill | Interest in technique, use, æsthetic qualities |
| Reasoning | Immature; by analogy or suggestion; logic premature | Logical, abstract; mental speculation |
| Social instincts | Less sympathy with adults, more with companions; competition increases | Strong sympathies; group loyalty; altruism; sex instincts developing |
| Sense of law | Increasing through games; contempt for artificial laws, customs; less submissive to authority | Conscience keen; marked lawlessness or law abiding; restive of restraint |
| Emotions | Weaker; fears increase; sex consciousness developing | Keen, subjective, whimsical; shyness and bashfulness; romantic love develops |
| Sense of humor | Keen, expressed in teasing, practical jokes, puns | Strong; riddles, puns |
| Will | Self-will increasing; tendency to vacillation, inertia | Self-will strong; potential will power |
| Religion | Conscience weak; reverence weak; religious indifference; formal interest in religious ceremonies, forms | Deep religious feeling or irreverence Idealism; mysticism; altruism. Conversion period |