<prompt> What is average birth weight at 2 years?Double of birth weightThrice birth weightFour times of birth weightSix times birth weight  <response>: Ans. is c i.e., Four times of birth weight AgeWeightBirth3 Kg5 months6 Kg 2 x birth weightI year9 Kg 3 x birth weight2 years12 kg 4 x birth weight3 years15 kg 5 x birth weight5 years18 kg 6 x birth weight7 years21 kg 7 x birth weight10 years30 kg 10 x birth weight 