Transfusion in utero for a fetus dying due to Rh incompatibility was first attempted back in 1960's. With an introduction of ultrasound into a modern obstetrics, this fetal management in utero has further developed into a totally new area in perinatal medicine. In 1980, hydrocephalus was first decompressed in utero using an ultrasound-guided percutaneous catheterization technique, and so was hydronephrosis in 1981. Animal experiments to define the feasibility of surgical correction in utero for other congenital anomalies, eg. congenital diaphragmatic hernia, spina bifida, Intrauterine Growth Retardation, has also been undertaken. The fetal treatment project, however, has raised various questions, eg. risk vs. benefit, ethical issues and so on. This paper summarizes the recent movement in fetal treatment in the United States.