But it's not! Your simply-posted question has no simple answer. Categorization of "is this a baby" works well when deciding if a 1-year old is a baby (yes); if

But it's not! Your simply-posted question has no simple answer. Categorization of "is this a baby" works well when deciding if a 1-year old is a baby (yes); if a rock is a baby (no). Is a 2 year old? Is a fetus? The "baby" categorization is unsuitable for this.