In what case would these two, the more developed and the less developed compete for the right to life.
During pregnancy is specifically what I want to focus on.
If the mother dies or is not capable of raising her child in a manner that is acceptable to society, what will become of the child and will they be better off alive or never having existing?
If a child's birth is going to cause the mother's dead, I don't think it's appropriate to give birth to the child. If the mother and father do not have the financial support to raise the child, I don't think it's appropriate to give birth to the child. If the mother and father cannot intellectually and physically raise the child so they can develop as normally as they can (we'll pretend that diseases and malformations don't exist), I don't think it's appropriate to give birth to the child.
It really is about what's best for the child.
If I'm honest, I was a bit confused by your post, so hopefully I made an appropriate response. If not, let me know and I'll try take another stab at it.