体重百分位
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身高百分位
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什么是WHO生长标准?

世界卫生组织(WHO)发布的儿童生长标准基于多中心生长参照研究(MGRS),在六大洲采集纯母乳喂养的健康婴儿数据,代表理想条件下的生长模式。中国卫健委也推荐使用WHO曲线。

百分位是如何计算的?

宝宝测量值通过 LMS 方法转换为百分位。L(偏度)、M(中位数)、S(变异系数)由WHO按月龄、性别提供。

公式来源:WHO MGRS, 2006 Z-score: 如果 L≠0,Z = [(体重/M)^L - 1] / (L × S)
百分位 = Φ(Z) (标准正态累积分布)

示例:12月龄女婴体重8.2 kg。WHO中12月女孩 M=8.2, L=0.179, S=0.128。Z=0 → 百分位50%。

常见问题

宝宝体重只有3%,是不是发育迟缓?

不一定。3%只是统计上的低位,若稳定沿曲线增长且精神状态良好,通常属于体质性偏瘦。但若从50%快速掉到3%,应就医评估。

身高和体重百分位不一致正常吗?

正常。只要各自曲线稳定,表示协调发育。医生会综合评估。

这个计算器适用多大年龄?

0-36个月,采用WHO数据。3岁以上请使用CDC或IOTF标准。

如何提高测量准确性?

定时、空腹、脱去厚重衣物,使用同一秤;2岁内卧式测量身长。

Weight Percentile
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Height Percentile
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What are WHO Growth Standards?

The WHO Child Growth Standards are based on the MGRS study and represent optimal growth for children 0–3 years.

How are Percentiles Calculated?

Using the LMS method with sex- and age-specific L, M, S values provided by WHO.

Source: WHO MGRS, 2006 Z = [(value/M)^L - 1] / (L × S) (if L≠0)
Percentile = Φ(Z)

FAQ

My baby is at the 3rd percentile. Is that unhealthy?

Not necessarily. Consistency matters more than a single value. A sharp drop warrants evaluation.

Why are weight and height percentiles different?

It's normal. As long as each curve is stable, development is balanced.

What age range does this cover?

0–36 months (WHO). For older children, CDC or IOTF references apply.

How can I get accurate measurements?

Weigh without heavy clothing, measure length lying down for infants under 2, and track consistently.