Behavioral Science

Early Stages of Life: Infancy to Childhood 7
What are the developmental milestones
at 4 to 5 months of age?
What are the developmental milestones
at 6 months of age?
What are the developmental milestones
at 9 months of age?
What are the developmental milestones
at 12 months of age?
What are the developmental milestones
at 15 months of age?
What are the developmental milestones
at 18 months of age?
Gross motor: rolls front to back and back
to front; sits well supported
Fine/visual: grasps with both hands
Language: orients to voice
Social: laughs; enjoys observing
environment
Gross motor: sits well unsupported; sits
upright
Fine/visual: transfers hand to hand;
reaches with either hand
Language: babbles
Social: recognizes strangers and has
stranger anxiety
Gross motor: crawls, pulls to stand
Fine/visual: uses pincer grasp; finger
feeds
Language: says “dada/mama”;
understands “no”
Social: waves bye-bye; plays
pat-a-cake
Gross motor: walks alone
Fine/visual: throws, releases objects
Language: one to eight words other
than “dada/mama”; one-step
commands
Social: imitates actions; comes when
called; cooperates with dressing
Gross motor: walks backward; creeps
upstairs
Fine/visual: builds two-block towers;
scribbles; uses a cup
Language: uses four to eight words
Social: throws temper tantrums
Gross motor: runs; kicks a ball
Fine/visual: feeds self with utensils
Language: points to body parts
when asked; names common
objects
Social: plays around but not with other
children; start of toilet training