Whereas at birth an infant is approximately 6 percent of its physique weight, the brain is already 25 percent of its adult weight; by age two years, these proportions are 20 percent and 77 percent, respectively.
From time period after conception to 2 years after birth, the brain grows earlier than the other organ, reaching about 25 percent of its adult weight at birth and almost 75 percent of its adult weight by age 2.
Newborn has very low listening ability and learning as brain develops the kid will learn new things and his brain starts to grow big . The brain will adapt to the language, color, light, and people's faces and so the child will learn fast.
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