Narrated Jabir:
Jews used to say: "If one has sexual intercourse with his wife from the back, then she will deliver a squint-eyed child." So this Verse was revealed:-- "Your wives are a tilth unto you; so go to your tilth when or how you will." (2.223)
USC-MSA web (English) reference: Vol. 6, Book 60, Hadith 51
Arabic reference: Book 65, Hadith 4528