Voluntary movements involve the use of large muscle groups and are typically large movements of the arms, legs, head, and torso. They are referred to as gross motor skills (or large motor skills). These skills begin to develop first. Examples include moving to bring the chin up when lying on the stomach, moving the chest up, rocking back and forth on hands and knees, and then crawling. But it also includes exploring an object with one’s feet as many babies do as early as 8 weeks of age if seated in a carrier or other device that frees the hips. This may be easier than reaching for an object with the hands, which requires much more practice (Berk, 2007). And sometimes an infant will try to move toward an object while crawling and surprisingly move backward because of the greater amount of strength in the arms than in the legs! This also tends to lead infants to pull up on furniture, usually with the goal of reaching a desired object. Usually, this will also lead to taking steps and eventually walking. 22
Physical Gross Motor Milestones
As stated above, children grow very quickly and meet physical milestones rapidly in the first few years of life. The following is a table of the major milestones (behaviors or physical skills seen in infants and children as they grow and develop that typically occur within normal range) that occur in children during those first formative years. 23
Table \(\PageIndex{1}\): Gross Motor Milestones (Developmental Milestones by the CDC is in the public domain)
Typical Age
What Most Children Do by This Age
2 months
Can hold head up and begins to push up when lying on tummy
Makes smoother movements with arms and legs
4 months
Holds head steady, unsupported
Pushes down on legs when feet are on a hard surface
May be able to roll over from tummy to back
Brings hands to mouth
When lying on stomach, pushes up to elbows
6 months
Rolls over in both directions (front to back, back to front)
Begins to sit without support
When standing, supports weight on legs and might bounce
Rocks back and forth, sometimes crawling backward before moving forward
9 months
Stands, holding on
Can get into sitting position
Sits without support
Pulls to stand
Crawls
1 year
Gets to a sitting position without help
Pulls up to stand, walks holding on to furniture (“cruising”)
May take a few steps without holding on
May stand alone
18 months
Walks alone
May walk up steps and run
Pulls toys while walking
Can help undress self
2 years
Stands on tiptoe
Kicks a ball
Begins to run
Climbs onto and down from furniture without help
Walks up and down stairs holding on
Throws ball overhand
Figure \(\PageIndex{1}\): An infant playing in the sand. (Image by Andres and Antoinette Ricardo used with permission)