For the sake of children's health, it is necessary for lactating mothers to carry out physical health care. Premarital examination must be done, which can avoid many genetic diseases. For example, if both parents carry the same deafness gene, then the child born will get two pathogenic alleles, and the probability of deafness is close to 100%. When you plan to have a baby, you should make preparations in advance, and it is best to avoid taking medicine within the first three months of pregnancy, because the residual components of some drugs may affect your baby. Then pay attention to your physical condition during pregnancy, try not to catch a cold or get tired. I wish you a healthy and lovely baby.