The baby lives inside a transparent membrane called the amniotic sac. The sac is filled with a salty solution which bathes the body's cells. In a complex process - the body recycles the fluid, swallowing some, absorbing some, expelling some - while at the same time manusacturing most of it. The embryo floats almost weightlessly in the fluid so it is protected from shocks and does not have to fight gravity.
The amniotic sac is the sac in which the fetus develops in amniotes. It is a tough but thin transparent pair of membranes, which hold a developing embryo (and later fetus) until shortly before birth. The inner membrane, the amnion, contains the amniotic fluid and the fetus. The outer membrane, the Chorion, contains the amnion and is part of the placenta. Its wall is the amnion, the inner of the two fetal membranes. It encloses the amniotic cavity and the embryo. The amniotic cavity contains the amniotic fluid. On the outer side, the amniotic sac is connected to the yolk sac, to the allantois and, through the umbilical cord, to the placenta.
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