According to ancient times and based on some info I found by doing a Goggle search, it means the child will be lucky, prophectic like, and have great clairvoyance. It is also called being norm in the "caul". I was interested in this too because my son was born in the sac last year.
The amniotic sac is what protects the baby, and the amniotic fluid is what the fluid inside the sac that the baby grows in.
It is the amniotic fluid that protects the baby, when the mother goes into labour its the sac that breaks( with the amniotic fluid inside ).
IM BF Nq RRTH
The amniotic sac breaks and releases the amniotic fluid - "water breaks"
Pregnant women do NOT pee in amniotic sacs- the amniotic sac surrounds the baby, you pee in the same manner, same way and same place as you always have. If any pee is in the amniotic sac, it is from the baby.
Amniotic sac
The Amniotic Sac is the sac that contains the baby.
It is the tissue that envelopes a baby in the womb, and contains the Amniotic fluid. This is what is referred to as "water breaking" when the sac is ruptured prior to birth.
the amniotic sac
I'm not sure what you mean by 'sets' of amniotic fluid. However the baby is in one sac, which is filled with the fluid. What made you ask this question? Often when a womens waters break, the fluid behind or above the baby my be stopped from flowing out due to the babys position, or if the waters break above the baby, then the amniotic sac may still be intact around its head.
This is the birth sac that needs to be removed so the baby can start to breathe. If you are talking about the sac that shows on an ultrasound, this is the amniotic sac that contains the 'waters' and is absolutely necessary for the growth of the baby. It is the same thing that the answer above mentions.
In much the same way as a human baby. The gorilla is enclosed in the amniotic sac and surrounded by amniotic fluid which cushions the unborn baby.