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
Handedness develops by age of
assistant
The correct answer is  Handedness is usually established by the 3rd year. Frustration may result from attempts to change children's hand preference, Variations in fine motor development reflect both individual proclivities and different oppounities for learning. Children who are seldom allowed to use crayons, for example, develop a mature pencil grasp later.(Refer: Nelson's Textbook of Pediatrics, SAE, 1st edition, pg no. 77)