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Within the first 3 years of life, the brain develops rapidly. Its development is characterized by critical developmental periods for speech, vision, hearing, language, balance, etc.; and alteration in any of the processes occurring in those critical periods can lead to specific delays in development.

north american journal of medical sciences

Thimerosal-containing hepatitis b vaccination and the risk for diagnosed specific delays in development in the united states: A case-control study in the vaccine safety datalink