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At what week is a baby's brain fully developed?
Neural tube development begins after conception, forming the basis of the brain and spinal cord.
By the end of the first trimester (around 12 weeks), the basic structure of the brain is formed, and major regions can be identified.
Rapid growth and refinement of the brain occur, with synapse formation peaking.
Continued growth and maturation of the brain, including the development of cortical folds and increased myelination.