Sayyiduna Jabir (may Allah be pleased with him) said: The Jews used to say that when a man has intercourse with his wife from behind, the child is born cross-eyed. So Allah Almighty revealed this verse: "Your wives are a tilth for you, so come to your tilth however you wish." [Surah al-Baqarah: 223]
(b) In the hadith of Abu Nu'aym: The Jews used to say that having intercourse with one's wife from behind causes the child to be born cross-eyed, so this verse was revealed.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب النكاح / 14100