system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
90% of Brain growth is achieved by the ___________
assistant
The correct answer is  Total brain volume at age 1 mo is approximately 36% of adult volume but by age 1 yr is approximately 72% (83% by 2 y).90% by 3 years of age. Ref.nelson 20th edition pg 65