<prompt> Height of children in 2-10 years of age is increased by-2 cmyear4 cmyear6 cmyear10 cm year  <response>: Ans. is c i.e., 6 cmyear 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 between 6-12 years. -- Nelson Amongst given option, 6 cmyear is the best answer. 