A major cognitive and physical change occurs as children become toddlers. They are most likely to: a. explore their world and develop new skills rapidly and their appetite does not change or fluctuate during this phase b. grow about two to three inches and gain approximately four pounds during the second year of life. All children come in different shapes and sizes and doctors often chart their growth to determine if there are any trends in the child's growth that may need attention c. develop a sense of a self-concept. They are aware of other people's feelings and thoughts in addition to their likes or dislikes d. think in specific , precise, and concrete ways