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.
Early Childhood Emotional And Social Development: Identity And Self-Esteem. During early childhood, children start to develop a self-concept, the attributes, abilities, attitudes and values that they believe define them. By age 3, (between 18 and 30 months), children have developed their Categorical Self, which is concrete way of viewing themselves in this or that labels.