What causes 2 afterbirths?

Question

Is it the posibility that there could have been twins? My mother AND grandmother both have had 2 afterbirths when they gave birth to children. Just on one for both, but I was just wondering what causes that....

Answer 1

Wow - that is interesting. My immediate thought was the possibility of twins, but I'm not sure... maybe one passed early in gestation?  

Answer 2

My older sister had two amniotic sacs when her oldest was born. IT was most likely a twin that died in utero and the sac wasnt reabsorbed. It passed when my niece was born.(twins run in our family)

ITs most likely that the twin died early on in utero and the placenta wasnt reabsorbed.