How many brain cells are typically present at birth?

At birth, the human brain contains approximately 100 billion neurons, which are the primary cells involved in processing and transmitting information through electrical and chemical signals. This number reflects the complexity and potential of the human brain even in the neonatal stage. During early development, particularly in the months leading up to and following birth, the brain undergoes rapid growth and an increase in the number of neurons. The 100 billion figure is widely accepted in the fields of neuroscience and developmental biology, highlighting both the intricacy of brain development and the significant capacity for learning and cognitive function that infants exhibit right from the start.

Furthermore, while the options suggesting lower or significantly higher numbers are not accurate, understanding the established figure assists in appreciating the foundational aspects of neural development and the brain's capacity for growth and adaptation in the early stages of life.