Dunn P M
Acta Paediatr Scand Suppl. 1985;319:180-7. doi: 10.1111/j.1651-2227.1985.tb10129.x.
The relation between weight and age in the two years following conception describes a gentle S-shaped curve. Between 28 weeks' gestation and 18 weeks' postnatal age the relationship appears linear, indicating a uniform incremental weight gain. The linear part of this curve has been used to help select an arbitrary reference line to reflect the normal average growth of a healthy population during this period. The flattening in the fetal growth curve usually observed after 40 weeks' gestation is considered to be due to the constraint of fetal growth and is therefore ignored. Arguments are advanced for believing that there is a normal distribution of weight around the central tendency at this time, and that, for practical purposes, normally growing fetuses and infants have an almost identical potential growth velocity during this period and differ for the most part only in the weight they have achieved at 28 weeks' gestation. Using these assumptions a versatile reference chart for international use has been created that is easy to remember and to construct. Allowance may be made for biologic variables such as sex and maternal height. It may be used to categorize groups of infants, to study longitudinal growth following delivery, as well as to compare different populations.
受孕后两年内体重与年龄的关系呈现出一条平缓的S形曲线。在妊娠28周和出生后18周之间，这种关系呈线性，表明体重呈均匀增加。这条曲线的线性部分已被用于帮助选择一条任意的参考线，以反映这一时期健康人群的正常平均生长情况。通常在妊娠40周后观察到的胎儿生长曲线变平被认为是由于胎儿生长受限，因此被忽略。有人提出理由认为，此时体重围绕中心趋势呈正态分布，并且出于实际目的，正常生长的胎儿和婴儿在此期间具有几乎相同的潜在生长速度，并且在很大程度上仅在妊娠28周时所达到的体重方面有所不同。基于这些假设，创建了一个易于记忆和构建的通用国际参考图表。可以考虑生物变量，如性别和母亲身高。它可用于对婴儿群体进行分类，研究出生后的纵向生长，以及比较不同人群。
