When does the thought "I exist" first appear in the human brain? Shortly after birth or somewhat later (a couple of days or weeks)? Actually, we become conscious around the second trimester of pregnancy. The first manifestation of emotion is found at 12 weeks - the fetus starts frowning and squinting its eyes. At 14, it tries to smile or express displeasure, and at 24 weeks, the fetus demonstrates behavior that may indicate true (cognitive) thinking. There is a suggestion that by showing anxiety, the fetus may be thinking. So, this behavior is a sign of "emergence of consciousness" in the baby🧠