THREE MONTHS:

• Does not respond to loud noises.
• Does not notice hands by 2 months.
• Does not follow moving objects with eyes.
• Does not grasp and hold objects.
• Does not smile at people.
• Cannot support head well.
• Does not reach for and grasp toys.
• Does not bring objects to mouth by 4 months.
• Begins babbling, but does not try to imitate any of your sounds by 4 months.

• Does not push down with legs when feet are placed on a firm surface by 4 months.
• Has trouble moving one or both eyes in all directions.
• Crosses eyes most of the time (occasional crossing of the eyes is normal).
• Does not pay attention to new faces, or seems very frightened by new faces or surroundings.
• Experiences a dramatic loss of previously learned skills.
• Does not babble.

SEVEN MONTHS:

• Seems very stiff, with tight muscles.
• Seems very floppy, like a rag doll.
• Head still flops back when body is pulled to a sitting position.
• Reaches with one hand only.
• Refuses to cuddle.
• Shows no affection for caregivers.
• Doesn't seem to enjoy being around people.
• One or both eyes consistently turn in or out.
• Persistent tearing, eye drainage, or sensitivity to light.
• Does not respond to sounds.
• Has difficulty getting objects to mouth.
• Does not turn head to locate sounds.

• Does not roll over in either direction (front to back or back to front).
• Seems impossible to comfort at night.
• Does not smile on his or her own.
• Cannot sit with help.
• Does not laugh or make squealing sounds.
• Does not actively reach for objects.
• Does not follow objects with both eyes at near (1 foot) and far (6 feet) ranges.
• Does not bear weight on legs.
• Does not try to attract attention through actions.
• Does not babble by 8 months.
• Shows no interest in games of peek-a-boo by 8 months.
• Experiences a dramatic loss of previously learned skills.

ONE YEAR:

• Does not crawl.
• Drags one side of body while crawling (for more than a month).
• Cannot stand when supported.
• Does not search for objects that are hidden while he or she watches.

• Says no single words ("mama" or "dada").
• Does not learn to use gestures, such as waving or shaking head.
• Does not point to objects or pictures.
• Experiences a dramatic loss of previously learned skills.

TWO YEARS:

• Cannot walk by 18 months.
• Fails to develop a mature heel-toe walking pattern after several months of walking, or walks only on his toes.
• By 15 months, does not seem to know the function of common household objects (brush, telephone, bell, fork, spoon).

• Does not use two-word sentences.
• Does not imitate actions or words.
• Does not follow simple instructions.
• Cannot push a wheeled toy.
• Experiences a dramatic loss of previously learned skills.
• Does not speak at least 15 words.

THREE YEARS:

• Frequent falling and difficulty with stairs.
• Persistent drooling or very unclear speech.
• Cannot build a tower of more than four blocks.
• Difficulty manipulating small objects.
• Cannot copy a circle.
• Cannot communicate in short phrases.

• No involvement in "pretend" play.
• Does not understand simple instructions.
• Little interest in other children.
• Extreme difficulty separating from mother or primary caregiver.
• Poor eye contact.
• Limited interest in toys.
• Experiences a dramatic loss of previously learned skills.

FOUR YEARS:

• Cannot throw a ball overhand.
• Cannot jump in place.
• Cannot ride a tricycle.
• Cannot grasp a crayon between thumb and fingers.
• Has difficulty scribbling.
• Cannot stack four blocks.
• Still clings or cries whenever parents leave.
• Shows no interest in interactive games.
• Ignores other children.

• Doesn't respond to people outside the family.
• Doesn't engage in fantasy play.
• Resists dressing, sleeping, using the toilet.
• Lashes out without any self-control when angry or upset.
• Cannot copy a circle.
• Doesn't use sentences of more than three words.
• Doesn't use "me" and "you" correctly.
• Experiences a dramatic loss of previously learned skills.

FIVE YEARS:

• Acts extremely fearful or timid.
• Acts extremely aggressively.
• Is unable to separate from parents without major protest.
• Is easily distracted and unable to concentrate on any single activity for more than five minutes.
• Shows little interest in playing with other children.
• Refuses to respond to people in general, or responds only superficially.
• Rarely uses fantasy or imitation in play.
• Seems unhappy or sad much of the time.
• Doesn't engage in a variety of activities.
• Avoids or seems aloof with other children and adults.
• Doesn't express a wide range of emotions.
• Has trouble eating, sleeping, or using the toilet.

• Can't tell the difference between fantasy and reality.
• Seems unusually passive.
• Cannot understand two-part commands using prepositions ("Put the doll on the bed, and get the ball under the couch.")
• Can't correctly give first and last name.
• Doesn't use plurals or past tense properly when speaking.
• Doesn't talk about her daily activities and experiences
• Cannot build a tower of six to eight blocks.
• Seems uncomfortable holding a crayon.
• Has trouble taking off clothing.
• Cannot brush teeth efficiently.
• Cannot wash and dry hands.
• Experiences a dramatic loss of previously learned skills.