6 to 8 hrs for digestion. it stays in the stomach for 2 hours and then in the intestine for another 2 hours. the undigested food goes to the large intestine and the digested food goes to whole body through blood. Carbhydrates and proteins about 1 1/2 -2 hrs. Fats 2 hrs.
And based on that a foetus does not posses self-awareness. Human babies have been found to become self aware between the ages of 18-24 months. The rouge test is a self-recognition test that identifies a human child's ability to recognize a reflection in a mirror as his or her own.
self-awareness - awareness of your own individuality. feel - an intuitive awareness; he has a feel for animals or it's easy when you get the feel of it; sense - a general conscious awareness; a sense of security; a sense of happiness; a sense of danger; a sense of self.