It is impossible to generalize whether 21 weeks placenta level 1 is good or not, and whether it will affect fetal development varies from person to person.
It is usually considered that the placental maturity level is zero between 28 weeks of pregnancy, and before 28 weeks of pregnancy, the placental maturity level is grade one. Before 28 weeks of pregnancy, placental maturity is grade 1, and the possibility of placental precocity cannot be ruled out. 21 weeks placenta grade 1 can be observed more often if there are no other health problems, no tendency to preterm labor, and symptoms of intrauterine development of the fetus can be observed on a regular basis, and it is fine to have a regular maternity check.
21 weeks placenta level of placenta blood perfusion decreased, affecting fetal nutrient absorption, resulting in intrauterine fetal hypoxia, fetal asphyxia death these situations is not good. Placenta previa induces gradual detachment of the uterine surface of the placenta from the uterus, leading to repeated vaginal bleeding, which is also not good.
21 weeks placenta level to find out the cause, there are abnormalities in time to deal with.