Your baby is making progress developing all of his external features and internal organs. His brain is functioning at 40 days. His mother can hear his heartbeat now on an ultrasonic stethoscope. His milk-teeth buds are present at 6 1/2 weeks. And it has been reported that a two-month old baby can suck his thumb. From this moment onward, your spiritually adopted baby grows and refines his body. But everything he needs to survive once he is born is already present by the end of the eighth week.