The height of a one-and-a-half-year-old boy is 73.6-92.4cm, with an average of 82.7cm, while that of a girl is 72.8-91cm, with an average of 81.5cm. The weight of a boy is 8.13-15.75kg, with an average of 11.29kg, while that of a girl is 7.79-14.9kg, with an average of 10.65kg. -At this time, babies can imitate adults and do simple gymnastic movements to the beat; they can pull dolls or toy cars back and forth with a small rope; they can imitate adults’ speech; and they will actively seek adults’ help when they encounter difficulties.