Ans: B (18 cm) Ref: Nelson Textbook of Pediatrics, 19th edition and Achar Textbook of Pediatrics, 4th edition.Explanation:Average Length/Height at different Postnatal AgesAt Birth - 50 cmAt 3 months - 60 cmAt 6 months - 65 cmAt 9 months - 70 cmAt 1 year - 75 cmAt 2 years - 87.5 cmAt 4 years - 100 cmAt 8 years-125 cmAt 12 years - 150 cm>>>Expected adult height can be calculated by the formula 2 * Height at 2 years of age.Average Cumulative Gain in HeightAt 3 months - 10 cmAt 6 months - 15 cmAt 1 year - 25 cmAt 2 years - 37.5 cmAlso Note:In first year of life, the height increases by 25 cm.In second year of life, the height increases by 12.5 cm.From 2-12 years - the height increases 6 cm per year.Weech FormulaTo calculate expected height between 2-12 yearsExpected Height (2 to 12 year) = Age 6+77 (in cm)Waterlow Classification of StuntingPercentage of ideal height expected for ageGrade of stunting>95%No Stunting90 - 95%Grade 185 - 89%Grade 2<85%Grade 3