The term 'yet to arrive' can be summed up in one word: UNBORN. UNBORN refers to a fetus or an embryo that has not yet been born. It is often used to describe a baby that is still in the womb and has not yet been delivered. UNBORN babies are typically referred to as fetuses until they reach the age of viability, which is usually around 24 weeks gestation. After this point, they are considered viable and can survive outside the womb with medical assistance.