Knowing whether your child’s behavior is developmentally appropriate can help you determine whether to discuss any concerns with your pediatrician. The following is a list of a social and emotional developmental milestones by age:

Birth To 6 Months

  • Demonstrates excitement by kicking, wiggling, or waving arms
  • Fearful of loud or unexpected noises, sudden movements, strange objects, and pain
  • Enjoys interacting with others and being held
  • Smiles socially and laughs out loud
  • Plays peek-a-boo
  • Enjoys looking at self in the mirror
  • Responds to other’s emotions

6 Months to 1 Year

  • Becomes upset when the primary caregiver leaves
  • Withdraws from strangers
  • Starts to imitate the behavior of others
  • Pushes, pulls, or pokes other children
  • Reacts to losing a toy

1 Year to 2 Years

  • Tries to get the attention of adults they are comfortable with
  • Begins to develop trust in those they are familiar with
  • Has temper tantrums
  • Is generally happy, but may become upset when they are interrupted in an activity
  • May become frustrated when unable to verbalize their thoughts and desires
  • Can be possessive of their toys and enjoy playing alone

2 to 3 Years

  • Begins to develop independence
  • Likes to be praised
  • Tests parental limits
  • Attempts to help adults with tasks
  • Plays with objects symbolically (i.e., imaginative play)

3 to 4 Years

  • Seeks to please adults
  • May become upset when their routine is affected
  • Begins to enjoy playing in groups
  • Shows an increased interest in others
  • Shares and takes turns with prompting
  • May act out scenes from movies

Reference:

Autism Speaks. (2019). 100 day kit: For new diagnosed families of young children. Autism Speaks Inc.