It is not permissible for you to depend on the medical opinion in this regard, as it is mostly based on assumptions. You cannot take the doctors' opinion for granted in this matter in particular, as information about the coming child is part of the Ghayb (Unseen) known only by Allah (Glorified and Exalted be He).
Thus, it is not permissible for you to use means of contraception or to avoid having sexual relations with your wife, for fear of having a deformed or disabled child. On the contrary, you have to rely on Allah (Glorified be He) and put your trust in Him, and remember that Allah (Glorified and Exalted be He) says:
And no moving (living) creature is there on earth but its provision is due from Allâh. And He knows its dwelling place and its deposit (in the uterus, grave).
(Part No. 19; Page No. 323) Both of you should ask Allah for righteous and healthy offspring that are free from defects. Allah (Glorified be He) says:
Invoke Me, I will respond to your (invocation).
He disposes the affairs of His Servants as He wishes. May Allah make things easy for you, grant you healthy and righteous offspring, and protect and cure your children, for He is the Omnipotent. May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.