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@balatka a z ciekawości poszukałam
https://www.ncbi.nlm.nih.gov/m/pubmed/17150070/

CONCLUSIONS: Contrary to expectations, it appears that an association between heartburn severity during pregnancy and newborn hair does exist. We propose a shared biologic mechanism involving a dual role of pregnancy hormones in both the relaxation of the lower esophageal sphincter and the modulation of fetal hair growth.