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Month1
An embryo forms the neural tube. The neural tube is the earliest nervous system tissue and eventually develops into the brain and the spinal cord. -
month 2
The neural tube begins to differentiate into brain cells and nerve cells. The brain cells transform into recognizable brain structures..The cerebral cortex is formed. -
Month 3
The basic brain development allows the embryo to display reflexes and react to its environment. -
Month 4
The fetus can experience sensory sensations such as sound, taste, and smells. -
Month 5
The fetus is learning to control it's reactions to the sensory sensations and to control its movement. -
Month 6
During the 6th month the ability to react to these sensations become stronger. -
Month 7
The baby's hearing is fully developed and he or she can change positions frequently and responds to stimuli, including sound, pain, and light. -
Month 8
Baby's brain is developing rapidly at this time, and he or she can see and hear. -
Month 9
brain weight doubles in the last 9 weeks of pregnancy.1 Much of the brain’s weight gain is due to the thickening of the myelin sheath around the nerves.