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Preschool
0–4 years of age

Infancy and toddlerhood is a busy time for children, who develop around 80% of their brains by age 3. Most of the development during this period happens during interactions and play with caregivers, so consistently showing up for your child and responding to their needs as best you can will support their successful development.

Developmental Milestones
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The following milestones, including cognitive, social/emotional, and physical domains, are markers of a child’s development from infancy on into adolescence. They are used to help determine if a child is undergoing typical development and/or if support may be helpful for them.
Milestones
What is happening cognitively?
Cognitive skills throughout infancy primarily include development of vision, attention, the ability to make various sounds, and the ability to understand simple words. During the toddler years, children begin to understand how common objects are used, play pretend, draw simple shapes, follow directions, use various gestures, expand their vocabulary, use two-word phrases, ask questions, and speak in ways that are understood by others.
What is happening cognitively?
Throughout this developmental stage, a child typically:
  • watches as you move
  • reacts to loud noises
  • turns head towards sound of your voice
  • understands the word “no”
  • communicates nonverbally (e.g., points to objects when asking for them)
  • copies/mimics adults (e.g., cooking in play kitchen)
  • points to at least two body parts when asked
  • uses objects to play pretend (e.g., feeding a doll)
  • shows simple problem-solving skills (e.g., using a stool to reach an object)
  • follows two-step directions (e.g., put toy down and bring me the book)
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Milestones
What is happening socially and emotionally?
Secure attachment begins in infancy and is built through consistent, caring, and competent bonding with their adult(s). Infants and toddlers learn mostly through interacting with their caregivers and through play. Infants mirror caregiver facial expressions, begin making noises or smiling to attract a caregiver’s attention, express basic emotions, recognize familiar people, and become cautious around unfamiliar people. Toddlers play with caregivers, show affection to caregivers, show more independence by helping with simple tasks, and play next to children (and eventually with other children).
What is happening socially and emotionally?
Typically at this developmental stage, a child will begin to:
  • calm when spoken to or picked up
  • smile when caregiver talks or smiles
  • recognize familiar people
  • scream or grunt when frustrated or annoyed
  • display shy, clingy, or fearful behaviors around strangers
  • react when you leave (for example, cries or reaches)
  • form attachments to people, toys, or books
  • show affection to caregiver and toys (e.g., hugs, cuddles)
  • notice when other people are hurt or upset
  • look at caregiver’s face to see how they should react in new situations
  • play next to other children (parallel play) and sometimes with them (associative play)
  • calm down within 10 minutes of caregiver leaving (e.g., at preschool or childcare)
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Milestones
What is happening physically?
During infancy and toddlerhood, children’s physical abilities develop quickly. In infancy, babies will develop from moving their arms and legs to standing with support. Toddlers learn how to feed themselves with their fingers and utensils, walk, run, jump, use the stairs, take off their clothes, and turn the pages of a book.
What is happening physically?
Typically at this developmental stage, a child will:
  • hold head up when on tummy
  • begin to develop teeth
  • get into sitting position on their own
  • move objects from one hand to the other
  • move around by rolling, crawling, or shuffling
  • progress from standing, to walking, to running
  • scribble
  • drink from a cup without a lid (may spill sometimes)
  • use fingers, then spoon and fork, to feed themselves
  • walk up a few stairs without help
  • use hands to twist (e.g., turning a doorknob or unscrewing a lid)
  • put on and takes off some clothes by themselves
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Mind the Signs

Adults and caregivers in a child’s life can keep an eye out for the following concerns that caregivers or children might have. Items under typical worries, such as separation anxiety or fear of the bath, are expected in infants and toddlers and are likely to go away with time. Items under warning signs, such as withdrawing from certain people or showing little interest in playing, might be a sign that something more serious is going on in a child’s life. If your child is exhibiting a behavior under the warning signs category and you are concerned, you should contact your child’s pediatrician or a professional of your choice for guidance.

  • Fear of loud noises
  • Fear of strangers (typically passes by 2 years)
  • Separation anxiety or fear of being away from caregiver (typically begins around 6 or 7 months, is most common around 14-18 months, and slowly goes away in early childhood)
  • Fear of the bath
  • Overstimulation
  • Shyness
  • Defiant behaviors
  • Sleep schedule or waking during the night
  • Tantrums
  • Taking off clothing/enjoying being nude
  • Exploring body and curiosity about bodies
  • Child is particularly clingy
  • Withdrawing from family or friends
  • Anger or aggression
  • Crying for no apparent reason
  • Nightmares or extreme fears
  • Shows little interest in playing
  • Large changes in eating habits
  • Headaches or stomach aches with no apparent physical cause
  • Inability to sleep
  • Wetting the bed (in toddlers who previously had stopped wetting the bed for some time)
  • Continuing to touch or attempt to touch their own or other’s genitals after someone has tried to distract them
  • Touching genitals in a way that irritates or injures them
  • Use of sexually explicit words
  • Sexually explicit play
  • Avoidance of specific adults
  • Symptoms of sexually transmitted infections or urinary tract infections
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