It is narrated from Sayyiduna Anas bin Malik (may Allah be pleased with him), in the story of li'an (mutual imprecation), that the Messenger of Allah (peace and blessings be upon him) said: "Keep watch on her: if she gives birth to a child that is fair, straight-haired and with inflamed eyes, then he belongs to Hilal bin Umayyah; and if she gives birth to a child with dark (kohl-like) eyes, curly hair and thin shins, then he belongs to Sharik bin Sahma'." He said: Then I was told that she gave birth to a child with dark eyes, curly hair and thin shins.
Muslim recorded it in the Sahih from Muhammad bin al-Muthanna.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الدعوى والبينات / 21276