The birth of a healthy child requires the joint efforts of both husband and wife. The embryo is formed by the sperm of the man and the egg of the woman, therefore, the preparation for pregnancy is also closely related to the relationship with the man, here we come to know: 6 precautions for men before pregnancy! 1, engaged in spraying pesticides, herbicides and other work of married men, at least 70 days time, should avoid his wife pregnant. Heavy metals such as lead, pot, aminomethylpurine, cotton phenol dioxygen, chloropropane and other industrial chemicals, affecting the process of spermatogenesis, therefore, before the wife’s pregnancy, the husband should be as little as possible exposure to such chemicals. 2, obese husbands in the process of weight loss, to avoid getting his wife pregnant. Generally speaking, the deposition of environmental pollutants in adipose tissue, less toxic to people, but in the process of rapid weight loss, the body reserves of fat will soon be re-decomposition of metabolism, and the accumulation of toxic substances in the fat, but also free out into the blood, and then spermatozoa cause direct or indirect harm. 3, the husband should not abuse drugs, not to mention the use of estrogen-containing skin cream. Many chemicals, such as estrogen, lisdexamfetamine, chlorpromazine, etc. will affect the viability of sperm and make the number of malformed sperm increase significantly. 4, the husband should do not partiality. Sperm production requires high-quality protein, calcium, zinc and other minerals and trace elements, arginine, a variety of vitamins. If the diet lacks these nutrients, the sperm production will be affected, or will produce some low quality sperm. 5, the husband should quit smoking and drinking. The damage of alcohol to spermatozoa has long been familiar to people, and many harmful substances in cigarettes will also kill spermatozoa. At least 3 months before conception should stop drinking and smoking. 6, the husband should also maintain a good and stable mood, keep moderate exercise. If you are often depressed, worried, or short-tempered, it will make the cerebral cortex dysfunction, resulting in the nervous system, endocrine function, testicular spermatogenesis and sexual function instability, affecting the production and quality of spermatozoa.