It is impossible to determine when either personhood or soul is present.  Since mind seems a subset of soul or so the good nuns taught me in grammar school, we know that in the fetus the connection to the cerebral cortex only begins at around 20 to 22 weeks gestation.  We also know that it is virtually impossible to keep a fetus alive if it delivers prior to 22 to 24 weeks.  So  a fetus is surly not yet a child.  It would seem to me that we would be wise to take care of our born children much better than we Christians are doing.  Too many catholics are not thinking properly when they call a zygote or a fetus a child.  Just is not a scientific or even a religious fact.  It is something that has been debated and misconstrued over the centuries.  Some early RC bishops taught that abortion was permissible until 12 weeks gestation.  The idea that conception or even the beginnings of cellular differentiation (gastrulation) is the beginning of soul or personhood is a bad misconception.