2008 Volume 13 Issue 1 Pages 57-65
There is no report which examines the change rate of the growth curve in physical growth of infant. The present study is to analyze the growth distance and velocity curves the change rate of height, weight, chest girth, head circumference and BMI in infant. The wavelet interpolation method is applied from 0 to 6 years of these physical items in infant, the growth distance and velocity curves are described, and the derived growth velocity curves are analyzed. A rapid increase for one year after the human was born was especially most remarkable for one month after the birth. When seeing age at largest peak velocity, boys and girls were just 0.05 years (18.3 days) about those all items. When seeing age at first local peak velocity, in height, boys were 1.55 years and girls were 1.50 years, and in weight, both of boys and girls were 1.65 years, and both ages was clearly different. However, that of boys were 1.50 years in both of the chest girth and head circumference, the chest girth was 1.45 years and head circumference was 1.35 years in girls, it was shown that first local peak velocity in the girl was a little earlier than that of boys. The gender difference was already inferred in growth velocity during infant in their head circumference. BMI was showing steady numerical value from 1.50years during infant, and was valid as the index. In conclusion, these data suggest that the aspect of growth velocity curve was made for maturity rate in gender difference clarified during infant.
