Toddlers

A toddler is a child 12 to 36 months old. The toddler years are a time of great cognitive, emotional and social development. The word is derived from "to toddle", which means to walk unsteadily, like a child of this age.

Toddler development can be broken down into a number of interrelated areas. There is reasonable consensus about what these include:

Although it is useful to chart defined periods of development, it is also necessary to recognize that development exists on a continuum, with considerable individual differences between children. There is a wide range of what may be considered 'normal' development.

At one year of age, the typical toddler will be able to display the following skills:

"If I want it, it's mine.
If I give it to you and change my mind later, it's mine.
If I can take it away from you, it's mine.
If I had it a little while ago, it's mine.
If it's mine it will never belong to anyone else, no matter what.
If we are building something together, all the pieces are mine.
If it looks like mine, it's mine."
—Burton L. White in his Raising a Happy, Unspoiled Child

Games: throwing and retrieving objects

Suggested toys:

Young children squat instinctively as a continuous movement from standing up whenever they want to lower themselves to ground level. One- and two-year-olds can commonly be seen playing in a stable squatting position, with feet wide apart and bottom not quite touching the floor, although at first they need to hold on to something to stand up again.

Talking is the next milestone of which parents are typically aware. A toddler's first word most often occurs around 12 months, but again this is only an average. The child will then continue to steadily add to his or her vocabulary until around the age of 18 months when language increases rapidly. He or she may learn as many as 7–9 new words a day. Around this time, toddlers generally know about 50 words. At 21 months is when toddlers begin to incorporate two word phrases into their vocabulary, such as "I go", "mama give", and "baby play". Before going to sleep they often engage in a monologue called crib talk in which they practice conversational skills. At this age, children are becoming very proficient at conveying their wants and needs to their parents in a verbal fashion.

There are several other important milestones that are achieved in this time period that parents tend not to emphasize as much as walking and talking. Gaining the ability to point at whatever it is the child wants you to see shows huge psychological gains in a toddler. This generally happens before a child's first birthday.

...
Wikipedia