The claim
「A bald patch on the back of the head means calcium deficiency」
Verdict
MythThe bald patch is friction from lying down and regrows once baby sits up more. It’s not calcium deficiency — nor are sweating or night waking, usually.
Sources
科学辟谣 · China Science Rumor-Refutation Platform (CAST & National Health Commission)
科学辟谣平台(中国科协 · 国家卫生健康委员会等主办). (2020/07/03). 孩子后脑勺没头发,是缺钙吗?. https://piyao.kepuchina.cn/h5/rumordetail?id=mnjg
Direct source · Government / official agency · checked 2026-08-02

