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.
By setting limits for children, you help them learn self-regulation, that is, how to set limits for themselves. The process of learning self-regulation and self-control begins in infancy, as babies begin to develop a sense of self. You can help by noticing your baby's cues and signals, providing responsive care, and making sure she has secure attachments to the other adults who care for her.