Final answer:
A child experiencing failure to thrive, severe diaper rash, and diarrhea may be deficient in vitamin D, leading to the development of rickets.
Step-by-step explanation:
The child with failure to thrive (FTT), severe diaper rash, and diarrhea may be experiencing a deficiency in vitamin D. Vitamin D deficiency can lead to a disorder called rickets, which is characterized by soft, weak bones and skeletal deformities.
Failure to thrive refers to a condition where a child is not gaining weight or growing as expected. Severe diaper rash and diarrhea can be symptoms of malnutrition caused by a lack of essential nutrients, including vitamin D.
Since vitamin D plays a crucial role in bone development and mineralization, its deficiency can result in improper bone development and skeletal deformities, as seen in the case of rickets.