Summary answer: Among men undergoing infertility evaluation, there is no significant relationship between semen parameters and defect rates in live or still births, even when considering mode of conception.

Can deformed sperm cause birth defects?

Issues with sperm morphology can affect the motility of the sperm, meaning that they do not swim as well or as efficiently. In addition, poor sperm shape can mean an increased chance of birth defects and issues with fetal health.

Does sperm quality affect baby?

Clearly, having healthy sperm is important. But sperm health goes beyond just conceiving. Sperm quality also plays a role in the health of the overall pregnancy and possibly the baby. In studies on mice, stress and obesity in male mice modified the genes carried in their sperm.