During the toddler period, children change from largely immobile and preverbal infants to walking, talking young children with a growing sense of autonomy
Weight and Height: toddlers gain about 5 to 6 lb and 5 in. a year, transitioning from a plump baby to a leaner, more muscular child
Head Circumference: increases about 2 cm during the second year
Body Proportion: toddlers tend to have a prominent abdomen and lordosis
Body Systems: continue to mature, with changes in respiration, heart rate, blood pressure, brain development, respiratory system, stomach secretions, and control of sphincters
Dentition: eruption of new teeth during the second year
Developmental milestones of the toddler years are less numerous but dramatic
Influenced by social contact, opportunities for exploration, and individual readiness for new skills
Milestones include fine motor skills like putting small pellets into bottles and scribbling, and gross motor skills like walking alone well and creeping upstairs