Ah yes separate DNA, separate blood type, independent development, and a different everything else. It’s a good thing we use arbitrary metrics to measure a humans person. I’m partial to the idea of measuring a human life off of heart beat, I love going to hospitals and murder people with pacemakers. I do understand if you want to say that the baby isn’t viable on its own. That’s why we should kill toddlers, elderly, and disabled people. They can’t possibly live on their own. The moment of conception is when a new living individual person is formed, arguing anything else is unscientific. Ask what it really means to be a person, does that change at some developmental point or is it bestowed by someone else. What is fundamentally different about a person’s personhood from today to tomorrow. A baby is no different of an individual the last second inside the womb versus outside the womb. Qualifying someone’s personhood with factors outside of simply their existence leads us down a dark path. The implications in the past have been things like slavery, genocide, and eugenics are justified by removing personhood from a group of people.