Experts pointed out that from unintentional harm to intentional avoidance, this is the result of years of efforts to prevent birth defects. But after all, the research results of professionals need to be implemented by expectant parents to be effective. How to improve pregnancy planning and do good pre-pregnancy health care? Get advice from experts. If you suffer from four diseases, you should postpone pregnancy. Some diseases are hereditary, and it is natural to find ways to control them;