22 weeks to do four-dimensional ultrasound clear?

22 weeks to do four-dimensional color Doppler ultrasound can be seen clearly, because the best time is between 20 weeks and 28 weeks, because this time is the child's brain development is relatively fast. And the overall structure has been formed, this time the baby's activity space in the uterus is still relatively large, the image will be clearer. Specific circumstances, you can according to the time on the prenatal check-up table to carry out the prenatal check-up. Usually in the diet must pay attention to eat some light, do not eat irritating food, cold food do not eat, can eat some fruits and vegetables, drink more boiled water, moderate exercise.