You may be right Katie. I'll get clarification on that tonight from my wife.<quoted text>
Forgive me, CD. I thought in uteri was plural.
A woman sometimes has a thin wall within her uterus and technically can have two ZEFs growing at different rates in uteri. Whereas a woman with no thin wall in her uterus has only one ZEF growing at one time in utero.
And if it turns out I'm wrong, you know me; I have no qualms with being the first to admit it, when I am.