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婴幼儿发展速度的差异是指婴幼儿本身的发展速度和婴幼儿间的发展速度的不同状况。婴幼儿在不同年龄阶段发展速度不同。3岁前的婴儿发展速度最快,尤其是第一年。新生儿平均体重3千克,1岁时9千克,体重增加3倍。身长平均50厘米,1岁时75厘米,身长增加50%。2岁时,体重12千克,平均身长为85厘米,较前稍慢。而在3～6岁的幼
Differences in the rate of development of infants and young children refers to the development of infants and young children themselves and the speed of development of infants and young children in different situations. Infants and young children at different stages of development at different rates. Infants up to age 3 develop the fastest, especially in the first year. The average weight of newborns 3 kg, 9 kg at 1 year old, 3 times the weight gain. Average length of 50 cm, 75 cm at 1 year old, 50% increase in length. 2 years old, weighing 12 kg, the average length of 85 cm, slightly slower than the previous. In 3 to 6 years old