<prompt> Height of children in 210 years of age is increased by2 cmyear4 cmyear6 cmyear10 cm year  <response>: After 4 years, the child gains about 5 cm in height every year, until the age of 10 years -- O.P. Ghai.An average child gains approximately 7-8 cm in height between the age of 2-6 years and 6-7 cm in height between6-12 years. -- NelsonAmongst given option, 6 cmyear is the best answer. 