BB 嘅膝頭哥係軟骨

BB 嘅膝頭哥(膝蓋骨)出世時主要係軟骨,要到幾歲先慢慢變成硬骨。

所以 BB 學行成日跌,膝頭都唔易傷到骨。下次佢「啪」一聲坐落地又冇事咁起返身,就係呢個原因 🦵

BB 嘅膝頭哥係軟骨
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