4. You have control over timing. Patients who are focused on their careers or who may have a unique life situation that affects exactly when they want their baby to be born will find that IVF gives them more overall control. Eggs or embryos can be cryopreserved for future use. You can then choose a window of time when you want to be pregnant – or when you want your baby to be born – counting backwards to determine the best time to proceed with IVF. IVF can also help with spacing children in a way that works best for your family.