10 weeks of the fetal baby although the first human form, from the adult form there is still a relatively large gap, the length of about close to 40 millimeters, the weight is only about 5 grams, generally can distinguish the fetal baby’s eyes, ears, nose, mouth, fingers, toes, etc., the proportion of the relative head is relatively large, the abdomen is more inflated, the limbs are relatively small. The 10-week fetal baby is still relatively small after all, ultrasound is not able to check very clearly whether there are various malformation problems. Usually you have to wait until about 12 weeks for an ultrasound to check for malformations. This time period of the baby is very susceptible to the influence of various external factors, to a variety of adverse stimuli can not be well tolerated, more likely to lead to the growth and development of the impact, resulting in malformations. So pregnant women must pay attention to avoid all kinds of bad contact.