North American Registry of Midwives (NARM) Practice Exam

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When does the bulk of human brain growth typically occur?

From birth to 6 months
From 15 weeks gestation to 2 years of age
From 28 weeks of gestation to 1 year
From 6 months to 3 years

The correct answer is: From 15 weeks gestation to 2 years of age

The bulk of human brain growth occurs from 15 weeks gestation to 2 years of age, which encompasses critical periods of neural development. During this timeframe, the brain undergoes rapid growth, forming millions of new neurons and establishing crucial connections through synaptogenesis. This is essential for cognitive, motor, and emotional development. In the earlier months of gestation, particularly around 15 weeks, the foundational structures of the brain are being established. Following birth, particularly during the first two years, the brain continues to mature significantly, supporting capabilities such as language acquisition, social interaction, and basic motor skills. The importance of this period is underscored in child development research, emphasizing how early experiences shape neural pathways. While growth does continue at various rates after these early years, the most substantial changes and growth in both size and complexity occur within this specified timeframe.