When do you see the fertilized ovum as 'the baby'?After 13 weeks, when it appears to be perfectly formed outwardly, it is no longer referred to as the fetus. From the 14th week quickening (movement) may be detected by the mother.The earliest I have heard of a baby surviving outside the womb, is 22 weeks of gestation. At this stage though, the eyelids are not yet separated and many practical hurdles lie ahead. It used to be from 28 weeks that a baby was considered potentially viable, but this may have been reduced to 24 or 26 weeks in some countries. (If a baby dies in the womb before this stage, it is a type of spontaneous abortion (of which there are several). If it dies afterwards, it is an intrauterine death, or, if after a live birth - a neonatal death.) Bearing in mind that pregnancy should last 40 - 41 weeks, even as late as 38 weeks, a baby can have difficulty with sucking. The ideal window to be born is roughly 10 days either side of the due date, when everything should work spontaneously and the contents of the skull are protected by adequate but not too much ossification of the bones. (Abnormal aspects of pregnancy or labour, always add postnatal problems.)Because of the multitude of difficulties in attendance, any baby born before 37 weeks is considered premature. It is prone to birth injury, difficulties with breathing and temperature regulation, feeding and blood sugar control, resisting infection, poor physical tone and low birth weight. The possibility of a lingering heart murmur is increased. Occasionally, a very small and premature baby seems to undergo a unique combination of stresses which have assisted in maturing the lungs prematurely, and it survives with only tube feeding of mother's milk, but this is rare. Neonatology as a recognised science is now, only about a 100 years old.Without good prenatal care and the option of surgery, babies die. And mothers die. The saving of a mother's life, so she may care for her other children, is the reason instruments were ever developed to remove the contents of the womb, if this becomes the last resort in labour, (which of course it still does in many countries). I have given this small amount of detail, to emphasise the value of 'fulness of time' in bringing a baby to birth successfully.