| A | B |
| reflex | An automatic body response to a stimulus. |
| motor sequence | Order in which a child is able to perform new movements. It depends on the development of the brain and nerves. |
| object permanence | An understanding that objects continue to exist even if a person cannot see them |
| deferred imitation | Watching another person's behavior, then acting out that behavior. This occurs between 18 and 24 months. |
| telegraphic speech | Two-word phrases used by toddlers when they first learn to combine words. |
| temperament | Quality and intensity of children's emotional reactions to their environment, such as passivity, irritability, and activity patterns. |
| attachment | The strong emotional connection that develops between people. |
| separation anxiety | A child's difficulty in separating from parents, often occurring between 6 and 15 months of age. |
| language comprehension | An understanding of language. Sometimes referred to as receptive or inner language. |
| expressive language | The ability to produce language forms; used to express a person's thoughts to others. |
| egocentric | Quality of people believing everyone things as they do. |
| gender roles | Behaviors expected of girls or boys. |
| self-concept | Qualities a child believes he or she possesses. A result of beliefs, feelings, and perceptions a child has of himself or herself as part of the world. |
| articulation | The ability to speak in clearly pronounced sounds. |
| stuttering | Speech disorder that is often characterized by repetition, hesitation, and prolongation. |
| rote counting | Reciting numbers in their proper order. |