Six months pregnant fetus head small may be measurement error, malnutrition, developmental deformities and other reasons, through regular observation, supplemental nutrition, termination of pregnancy and other ways to solve. 1. Measurement error: the small size of the head of the fetus in the sixth month of pregnancy may be caused by the pregnant woman’s irregular menstruation, inaccurate gestational week or ultrasound measurement error, etc. The development of the fetus is normal in all aspects, without special treatment, you can first temporarily observe. 2. Malnutrition: usually have excessive picky eating and weight loss pregnant women, there may be malnutrition problems, through the ultrasound will also be found in six months of fetal head small, usually pay attention to nutritional supplements, eat foods rich in protein, iron, calcium, such as milk, eggs, beef, maternal milk powder and other supplemental nutrients, is conducive to the growth and development of the fetus. 3. Developmental malformations: The small head of the fetus in the sixth month of pregnancy may be caused by microcephaly, craniosynostosis and other diseases, and it is necessary to pass the three-level ultrasound screening to check whether the fetal cranial structure is normal. At the same time, prenatal diagnosis should be carried out to exclude the possibility of chromosomal and genetic abnormalities in the fetus, and to determine the problem of malformation, you can promptly induce labor to terminate the pregnancy treatment. In the middle and late stages of pregnancy, we should do a good job of pregnancy and obstetric examination, there are abnormalities can be dealt with in a timely manner.