In a different thread (see Midwife in Mariology), I quoted the Protoevangelium of James about the birth of Christ. In this thread is Tertullian arguing against that docetic notion. (These two sources were written about the same time.) Tertullian is speaking against Marcion, who appears to be a candidate for the author of PoJames (or Apelles, disciple of Marcion, who posited normal flesh, but also not a normal birth).
"Come now, beginning from the nativity [of Christ] itself, declaim against the uncleanness of the generative elements within the womb, the filthy concretion of fluid and blood, of the growth of the flesh for nine months long out of that very mire. Describe the womb as it enlarges from day to day, heavy, troublesome, restless even in sleep, changeful in its feelings of dislike and desire. Inveigh now likewise against the shame itself of a woman in travail which, however, ought rather to be honoured in consideration of that peril, or to be held sacred in respect of (the mystery of) nature. Of course you are horrified also at the infant, which is shed into life with the embarrassments which accompany it from the womb; you likewise, of course, loathe it even after it is washed, when it is dressed out in its swaddling-clothes, graced with repeated anointing, smiled on with nurse’s fawns. This reverend course of nature, you, O Marcion, (are pleased to) spit upon; and yet, in what way were you born? You detest a human being at his birth; then after what fashion do you love anybody? Yourself, of course, you had no love of, when you departed from the Church and the faith of Christ."
ANF03. Latin Christianity: Its Founder, Tertullian - Christian Classics Ethereal Library
That's the normal birth of Christ. In fact, Tertulian describes it as the tradition of the Church and faith of Christ.
"Come now, beginning from the nativity [of Christ] itself, declaim against the uncleanness of the generative elements within the womb, the filthy concretion of fluid and blood, of the growth of the flesh for nine months long out of that very mire. Describe the womb as it enlarges from day to day, heavy, troublesome, restless even in sleep, changeful in its feelings of dislike and desire. Inveigh now likewise against the shame itself of a woman in travail which, however, ought rather to be honoured in consideration of that peril, or to be held sacred in respect of (the mystery of) nature. Of course you are horrified also at the infant, which is shed into life with the embarrassments which accompany it from the womb; you likewise, of course, loathe it even after it is washed, when it is dressed out in its swaddling-clothes, graced with repeated anointing, smiled on with nurse’s fawns. This reverend course of nature, you, O Marcion, (are pleased to) spit upon; and yet, in what way were you born? You detest a human being at his birth; then after what fashion do you love anybody? Yourself, of course, you had no love of, when you departed from the Church and the faith of Christ."
ANF03. Latin Christianity: Its Founder, Tertullian - Christian Classics Ethereal Library
That's the normal birth of Christ. In fact, Tertulian describes it as the tradition of the Church and faith of Christ.