Does the shape of the sperm affect pregnancy?

Abnormal shape of the sperm is called teratospermia. The most important semen parameters are motility and number of sperm. I would suggest repeating the semen analysis if the sperm concentration is found to be low, since there is a normal variability in the concentration of sperm. If these parameters are normal and only the shape is abnormal, then your husband needs to be evaluated for a varicocele (enlargement of veins around the testis). He will need to consult with a urologist to confirm whether he has this condition.