Ditto. This is the teaching of the Catholic Church and is backed up by the bible:
“Indeed, I was born guilty, a sinner when my mother conceived me” (Ps. 51:5, NRSV). This indicates that the unborn child possesses a sinful, fallen nature at the time of conception (though it does not manifest in actual, personal sins until later; cf. Romans 9:11). Since sin is a spiritual phenomenon, the presence of a sinful nature indicates a spiritual nature and thus a soul, making the child a complete human being from conception.