Final answer:
The measurement that indicates the risk factor for Failure to Thrive (FTT) among infants and children is weight <75% of median weight for age. Failure to thrive refers to inadequate growth or weight gain in children and can be a sign of undernutrition or health problems.
Step-by-step explanation:
The measurement that indicates the risk factor for Failure to Thrive (FTT) among infants and children is C. weight <75% of median weight for age. This means that the child's weight is less than 75% of the average weight for their age group. Failure to thrive refers to inadequate growth or weight gain in children. It can be a sign of undernutrition or a health problem, and if left uncorrected, it can lead to permanent deficits in size.