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 CharacteristicsBirthFirst Six MonthsSecond Six Months
Organs rapidly growingMuscles, bones, brain, visceraAs first 6 months, and teeth
Organs proportionately largeHead, surface, intestines, liverHead, intestines, liver, surface
Organs proportionately smallStomach, lung capacity, legsStomach, lungs, heart, legs
Organs proportionately strong in functionAnti-bodies, kidneys
Organs proportionately weak in functionDigestive and respiratory systems; tissues flabbyDigestive, respiratory, nervous systems; leucocytes, hemoglobin
DentitionNo teeth (rudiments of both sets in jaw)2 teeth6-8 teeth
NervesTotal number of cells but development incompleteEasily exhausted; peripheral nerves sensitive; sensory and motor centers developingAs first six months; spinal and brain associations connecting
Sense developmentNo hearing; sight only for light and darkness; touch vague; sensitiveness to temperatureHearing begins; eyes begin to converge and work togetherColor sense, sound, rhythm developing
Special organs or systems at developmental stage, needing much immediate exerciseLungsMuscles of arms, legs, trunk, hand; lungsAs first 6 months; muscles of creeping, hand, speech organs
Defects easily acquiredEyestrain; blindnessBones misshaped; eyestrain; nerves; dispositionAs first six months
Defects easily overcomePhimosis temperament;Bones; phimosis; tongue-tie, harelip
Illness most susceptibleCold, pneumonia, jaundice, inflammation of navelDigestive, pulmonary; rickets; nervous disorders, erysipelas
Most common immediate causes of death[2]Congenital debility; syphilis; prematurity, accidentsCongenital debility, digestive disturbances, pneumonia, whooping cough, bronchitis, convulsions, measles, meningitis
Nature and rate of mentalityVague, indefinite, slow, gropingSlow, vague, diffusedMore definite, alert, quickened
Motor activitiesChiefly reflexGrasping, waving arms, hands; kicking; few vocal soundsSitting, creeping standing, prattle
Sense activitySlight, vagueTouch, sight, hearing becoming activeSight, touch, hearing, active
AttentionNoneBegins in staring, handlingListening, examining
PerceptionDimly beginsVague
CuriosityBegins, vagueObjects in reach, opening doors, pulling; exploring cupboards
ImitationOf moods and vocal sounds of adultsMechanical, of vocal sounds, moods, facial expression
MemorySlightFaint, vague; motorFor familiar acts and faces, responses to his crying
ImaginationNoneGlimmeringsGlimmerings
ReasoningDawning, by associationBy association, increasing
Social instinctsEgoistic, strong; trustful, responsive to careTrust, desire for companionship of adults
Sense of lawVaguely sensed, as association of cause and effect; and in rhythm of regular regimenDeveloped through regular regimen and beginnings of obedience, especially to direct commands
EmotionsSlight, vagueFear, sympathy, confidence, satisfaction, angerControl weak but susceptible to training
Sense of humorNoneNone; smiling beginsShown in surprise, plays, laughing
WillTemperamental expressionPersistent; shown in temper
ReligionBegins in trust, dependenceHuman sympathy, confidence, obedience
Physical CharacteristicsSecond YearThird YearFourth Year
Organs rapidly growingBrain, teeth, muscles, bones, visceraTrunk, brain, teethUpper arm, thigh; brain still increasing; bones
Organs proportionately largeIntestines, liver, kidneys, arteries, head, surfaceAs second yearAs second year
Organs proportionately smallLegs, lungs, heartLungs, legs, heart
Organs proportionately strong in functionHeart, fundamental musclesAs third year
Organs proportionately weak in functionAs first yearEyes, hands, fingers, legs, nerves, digestive, respiratoryAs third year
Dentition6 teeth cutCompletion of first set
NervesMotor coördinations developing, association centers developingSensory-motor coördinations formingSensory keen, motor coördinations rapidly developing (fundamental)
Sense developmentHearing discriminate; touch becoming keen, sight definite, focusedTouch, muscular, sight, sound; increasing discriminationIncreasing keenness, discrimination
Special organs or systems at developmental stage, needing much immediate exerciseMuscles of walking, forearm, hand; speech, sight, touch, hearing; teethTrunk, back, arms, legs, hands, speech, senses, teeth, respiratoryArms, legs, trunk; sensory-motor coördinations; sensory nerves; teeth; lungs
Defects easily acquiredBones; teeth, speech, nerves, dispositionBones, teeth, speech, nervesEyes, bones, speech, nerves, teeth
Defects easily overcomeBones; cleft palate, temperamentBones, teeth, speech, eyesEyes, bones, speech, teeth
Illness most susceptible toDigestive, respiratory; ears, throat, nerves; scurvy, ricketsDigestive, respiratory; ears, throat, infectious feversDigestive, respiratory; measles, scarlet fever, whooping cough, colds
Most common immediate causes of deathDigestive disturbances, croup, pneumonia, diptheria, bronchitis, tuberculosis, measles, meningitisPeriod of low death rate; pneumonia, tuberculosis, croup, diptheria, meningitis, scarlet feverLow death rate; Pneumonia, diptheria, croup, tuberculosis, meningitis
Nature and rate of mentalityGaining in definiteness, slowImpulsive, flitting, slowActive, slow
Motor activitiesAlertness, but inefficient Runs, throwsIncreasing coördination of legs, arms, eye, and handQuiet games preferred to active; dawdling; spontaneous
Sense activityKeen, especially touch. Acquiring discriminationHandling, listening; sight, touch, sound discriminationAt best, most active
AttentionIncreasingFlitting, concentration increased in doingVoluntary—weak Involuntary—strong
PerceptionGaining clearness, definitenessStill vague, but becoming definiteStill vague, improving
CuriosityInsatiable; objects in environmentVaried; names; animals; mechanical processesInsatiable
ImitationConstant, of adult actions, voiceAdult actions, speech, moodsChiefly adult occupations, less impulsive; literal
MemoryFor names of things; emotions, simple movementsVerbal and motor good; emotionsVerbal, motor and emotional strong
ImaginationSlightly increasingConcrete, vividAuditory and motor images more distinct than visual; concrete
ConstructionBuildingPersistent, for motor activityFor activity, immediate use
ReasoningBy association of experiencesBy association of experiencesBy association; ludicrous inferences; guessing period
Social instinctsIncreasing sense of ownershipSocial dependence on an adult; slight play with other childrenSelf-assertive; selfish; quarrels over property
Sense of lawDiscerned in regularity of régime: in commands, rewards, punishmentsDim: susceptible to training; sense of ownership developingDisorderliness; imaginative tales taken for lying
EmotionsTrust, fear, angerLove, fear, anger easily stirred; little controlEasily aroused, keen; pity begins; imaginary fears
Sense of humorIn surprises, in tumblesIn grotesque situations, being caught, hidingPersistent; crude; in grotesque
WillVacillating, temperamentalLittle controlUnreasonable; persistent
ReligionRespect for parents, trust. Obedience to parentsObedience, trust, respect for authorityAnimistic; invests inanimate things with life
Physical CharacteristicsFifth YearSixth YearLater Childhood 6-9 years
Organs rapidly growingSee 4th yearLegs, arms, chest girthMotor cells in brain. Period of slower physical growth; cessation of rapid brain growth
Organs proportionately largeSurface, intestines, kidneys, arteriesAs 5th yearDigestive system, liver, kidneys, surface, legs
Organs proportionally smallAs 4th yearAs 4th yearTrunk, heart, lungs
Organs proportionately strong in functionDigestive and respiratory ability increasingDigestive and respiratory ability increasingLeg muscles
Organs proportionally weak in functionAccessory muscles and nerves; eyes, fingers, throatAs 5th yearHeart; low blood pressure; teeth
DentitionSheds some first teeth2nd dentition
NervesAssociation fibres rapidly developing; see 4th yearAs 5th yearRapid growth of association fibres in brain; easily fatigued in 8th year
Sense DevelopmentKeen developmentSenses correlated; finer discriminationEyes developed for finer work
Special organs or systems at developmental stage, needing much immediate exerciseAs 4th yearAs 4th yearMuscles of arms, legs, trunk Muscles of forearm, 8 years. Muscles of fingers, 9-10 years
Defects easily acquiredSpinal curvature, defective teeth speech disorders, eyestrain
Defects easily overcomeSpeech disorders
Illness most susceptibleDigestive, respiratory, ears, diphtheria, rheumatism, measles, scarlet feverAs fifth yearInfectious diseases, rheumatism, nervousness, anemia, digestive disturbances; illness increases 8th year
Most common immediate causes of deathPeriod of low death rate As 4th yearPeriod of low death rate As 4th yearLow mortality; pneumonia, tuberculosis, diphtheria, croup, measles, kidney and heart disease
Nature and rate of mentalitySteadier, quicker, more alertMore definite, alert, quickerHesitating, impulsive, restless
Motor activitiesIncreasing coördinations, rhythmic movements, skippingIncreasing correlation. Steadier action, marching, dancingFinger movements stronger, more precise; actions not well coördinated
Sense activityFiner discriminations; notices sound, colorImprovising on piano; eagerness to color; tastingSenses become practically perfected; sensory interest weaker
AttentionVoluntary—weak; involuntary-strongPurposive inattention; keener concentration in playFlitting; lack of endurance, application
PerceptionClearer, many groupsClearerTruer to realities, more distinct; differentiates between real and imagined
CuriosityIntense (see 4th year)Physical properties; processes; causes; birthAsks “What is it for?” Wider range of interests
ImitationDramatic, of adult activities, animals; literalDramatic; adults’ activities, animals; less literalDecreasing, imitates idea rather than action
MemoryVerbal, strong; learns nonsense, poetryVerbal, strong; poetry, stories; motor, emotional, strongLiteral, increasing in ability
ImaginationStrong visual, lives in imagination; invents storiesAs 5th year; fanciful tales of personal experienceLess fanciful; related more to facts and needs of life
ConstructionFollows idea; for activity, use, æsthetic interestThings for use; æsthetic interestBegins to be creative; interest begins in finish, workmanship
ReasoningSee 4th year, reasons by analogy; attempts arguingAs 5th yearLittle use for explanations or logic
Social instinctsPrefers child to adult; love of emulation; selfish; ownershipSelf-sufficiency; homesickness; begins group playGroup play, circle games; slight respect for property rights
Sense of lawNo sense of property rights; disobedience increasesAs 5th year. Increasing; rigid, literalExpects to be held to law and consequences; respects power that requires obedience
EmotionsSee 4th year; jealousy; fears animals; imaginary fearsDegree of controlIncreasing control, reserve
Sense of humorSee 4th year. Drawings, practical jokesAs 5th year. SillinessIncongruities of action; play on words; disasters
WillIncreasing forceAs 5th yearVacillating
ReligionWonder in nature; reverence; prayer; obedienceAs 5th year; imitative interest in formal worshipPeriod of ceremony, forms, rites Animistic tendency weakening
Physical CharacteristicsYouth
Girls, 9-12 years
Boys, 9-13 years
Early Adolescence
Girls 12-16 years
Boys 13-18 years
HeightSlow growth; girls more rapid than boysRapid increase (Girls, 11-14) (Boys, 13-17)
WeightSlow growthRapid increase ” ”
Organs rapidly growingLegs, armsTrunk, legs, arms, lungs, reproductive organs, heart, liver, kidneys; proportions changing
Organs proportionately largeArteriesHands, feet, arms, legs
Organs proportionately smallHeart, trunk arteriesTrunk, internal organs,
Organs proportionately strong in functionMuscles, legs, eyesHeart, lungs; blood pressure high; muscles, fundamental and accessory
Organs proportionately weak in functionHeart, lungs; blood pressure; eliminationNerves; internal organs, elimination; motor coördinations because of change in bodily proportions
DentitionComplete (except wisdom teeth)
NervesReactions vigorousUnder strain; easily unbalanced
Sense developmentComplete, including eyesSenses keen
Special organs or systems at developmental stage, needing much immediate exerciseMuscles of trunk, forearm, fingers; motor adjustments; lungsMuscles of trunk, arms, legs, fingers; lungs
Defects easily acquiredSpinal curvature, eyestrain; precocious sex developmentOf reproductive system; shallow breathing
Defects easily overcomeBones, teethBones, lung capacity
Illness most susceptibleAnemia, rheumatism, heart weakness, nervousness; period of low morbidityAnemia, nervousness, malnutrition; tuberculosis (girls); increased morbidity
Most common immediate causes of deathPeriod of low mortality. Pneumonia, tuberculosis, diphtheria and croup, heart and kidney diseases, accidental drowningsPneumonia, tuberculosis, kidney and heart disease, accidental drownings
Nature and rate of mentalityDirect, alert; more orderly, controlledWell coördinated, more abstract, logical, comprehensive; routine irksome
Motor activitiesWell coördinated; need much exercise; new adjustments readily madeMuscular awkwardness during growth
Sense activitySure, acute, subordinate to thoughtAcute; all senses
AttentionVoluntary increasingPotential voluntary attention strong
PerceptionClearerClear
CuriosityLess keenWide range; persistent; craving for larger experience
ImitationLess marked; of idea rather than actionOf ideals, strong; originality marked; individuality
MemoryQuick, sure, lasting; period of rote learningAt best; logical
ImaginationClear, creativeVivid, comprehensive, creative; works for remote ends
ConstructionConstructs for purpose; interest in workmanship, skillInterest in technique, use, æsthetic qualities
ReasoningImmature; by analogy or suggestion; logic prematureLogical, abstract; mental speculation
Social instinctsLess sympathy with adults, more with companions; competition increasesStrong sympathies; group loyalty; altruism; sex instincts developing
Sense of lawIncreasing through games; contempt for artificial laws, customs; less submissive to authorityConscience keen; marked lawlessness or law abiding; restive of restraint
EmotionsWeaker; fears increase; sex consciousness developingKeen, subjective, whimsical; shyness and bashfulness; romantic love develops
Sense of humorKeen, expressed in teasing, practical jokes, punsStrong; riddles, puns
WillSelf-will increasing; tendency to vacillation, inertiaSelf-will strong; potential will power
ReligionConscience weak; reverence weak; religious indifference; formal interest in religious ceremonies, formsDeep religious feeling or irreverence Idealism; mysticism; altruism. Conversion period