20 weeks, why is there no normal fetal movement?

Is abnormal, because fetal movement, generally in pregnancy 16~20 weeks when it will show, therefore, it is recommended that pregnant women should be timely to the hospital for examination, accurate check of gestational weeks, to see if the gestational week calculation error. During pregnancy, pregnant women should regularly go to the hospital for prenatal check-ups, so as to ensure the health of the fetus, and pregnant women should eat more nutritious foods to ensure the comprehensiveness of nutrition, so that the fetus can develop healthily. During pregnancy, pregnant women should give up bad living habits, do not smoke or drink, otherwise it will affect the health of the fetus.