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The early child period is considered to be the most important developmental phase throughout the lifespan.
When it comes to development, timing is everything! â¢ The embryonic period (3rd to 8th weeks) is the most sensitive time for. causing structural birth defects. â¢ The fetal period (9th week to birth) is not very sensitive to teratogen. induced birth defects, although some organs remain at risk, especially the.