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Infants typically double their weight by their third month, and triple it by their first birthday.

​The primary pioneer in the study of behaviorism was Erik Erikson.

​During pregnancy, it is necessary for the mother to eat 10% to 20% more calories than regular in order to adequately provide for the needs of her unborn child.

Many parents emphasize conversational turn-taking even before a child can speak her first word.

By the age of 24 months, most children can climb steps, walk backward, and kick a ball.

​The entire group of individuals that is the focus of interest in a research study is called the sample, while the small subset of group that is actually studied is called the population.

Parents are more effective than videos in teaching new words to their children.

​If a dominant gene meets up with a recessive gene, the traits that are contained in the dominant gene will ultimately be expressed.

​The biggest limitation of conducting correlational research is the lack of ability to draw conclusions about cause-and-effect relationships.

Tosha is playing jacks, and each time she bounces a ball she has to pick up one additional jack. She uses private speech as she counts the number of jacks in her head rather than out loud.