22 weeks pregnant placenta is usually grade 0, if there is a grade 1, as long as the combination of the results of the obstetric examination to determine whether there is any abnormality, pregnant women do not need to worry too much. Usually the ultrasound results of the placenta maturity is divided into 4 levels, level 0 placenta immature, mostly appeared before the 28th week of pregnancy, level 1 placenta tends to mature, mostly appeared in the 29th to 36th week of pregnancy, level 2 placenta for the maturity period, usually after the 36th week of pregnancy, level 3 placenta has matured and tends to aging, most often seen after the 38th week of pregnancy. The placenta of pregnancy 22 is different for each pregnant woman, if there is a grade 1 placenta may also be normal, no need to be overly nervous, need to be assessed in conjunction with the specific situation of the fetus. During pregnancy, you should be on time for maternity checkups, and if there are any abnormal symptoms, you should go to the hospital in time for checkups and treatment under the guidance of your doctor.