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.
Social awareness is the ability to observe others and the desire to be like them. At the age of 18 months, children become fascinated by the behavior of other children their own age or older. This is why often the 2nd and 3rd child is potty trained a lot earlier than the first child. By the age of 24-30 months, they start to understand gender differences and focus on imitating the behavior of the same sex parent.