The Christians came to Muhammad and argued with him about Jesus, son of Mary. They asked him who his father was and uttered many lies and slanderous things about Allah - he is the only god; he has neither wife nor child. Muhammad said to them: "Do you not know that our lord is living and that he will not die? Jesus, however, was exposed to mortality." They said, "Yes." He asked them, "Was there a reason for Jesus being different?" They said, "No." He said, "Do you not know that nothing is hidden from Allah, whether on earth or in heaven?" They said, "Yes." He said to them, "Did Jesus know more than Allah taught him?" They said, "No." He said: "Our Lord fashioned Jesus as he pleased, in his mother's womb. Do you not know that our Lord neither eats nor drinks nor eliminates anything unclean?" They answered, "Yes." He said: "Do you not know that Jesus' mother was pregnant with him and bore him as every mother does her child; that he was nourished like every child, and that he ate, drank, and relieved himself of impurities?" They said, "Yes." He said, "How can what you claim be true?"Source: Ibn Hisham, as-Siratu'n-nabawiyya, Cairo 1955, Vol. 1, pp. 224-225.
HT to http://www.light-of-life.com/eng/sources/