It all begins when the luckiest and strongest sperm wades through the treacherous cervical mucus to finally meet the eagerly waiting egg in the magical fallopian tube. And thence life begins with the fertilised egg taking another six to 12 days to get home; the uterus, where it grows and changes form in the next nine months, should everything go well.
An excited man and woman will hope that the egg and sperm that will produce their baby are the healthiest options they had; to give their child the best chance possible. Sometimes that’s the case. Other times it isn’t.