The fetuses are spaced out along each horn of the uterus throughout pregnancy. Each fetus has its own placenta, which provides it with nutrition, and is housed within its own membranes. The uterus can be visualized as a muscular, sausage-shaped bag that can constrict along its length as well as around its diameter. Each fetus is enclosed in a rather tough, double-layered bag of membranes called the fetal bag, which is filled with a slick fluid in which the fetus floats. When the uterus relaxes in front of it and contracts behind it during parturition, this acts as both protection and lubricant and creates a distending, stretching, and dilating action.
in Cat's Care, Health
When to wait and when to panic about a difficult cat birth
Knowing when to worry and when to wait
