The height of a two-year-old boy is 78.3-99.5cm, with an average of 88.5cm, weight is 9.06-17.54kg, with an average of 12.54kg, and head circumference is 44.6-52.5cm, with an average of 48.4cm. At this time, the baby is able to jump on both legs, and can leave the ground when jumping, pinch the pages of books with his hands, turn pages, ask questions, and follow They like to ask questions, and they like to walk and play behind children who are older than them. At this time, the baby can understand some reasoning, can read his parents’ expressions, can understand praise and criticism, and knows who likes him. If the baby is interested in playing for half a day and suddenly starts to cry, the mother may think that the baby is bored and continue to play with him, then the baby may cry even more, but in fact it is because the baby is tired and needs to rest.