failure to thrive

Failure to thrive is a medical term which denotes poor weight gain and physical growth failure over an extended period of time in infancy. Often abbreviated FTT, the term has been in medical use for over a century. As used by pediatricians, it covers poor physical growth of any cause and does not imply abnormal intellectual, social, or emotional development.
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Failure to thrive is used to describe a delay in a child's growth or development. [more]Failure to thrive - Community and Resources

Condition in which an infant does not develop or grow normally

a condition in which a child loses or fails to gain weight and grows at a slower rate than expected. Failure to thrive may be due to faulty metabolism, illness or malnutrition; HIV positive children often exhibit failure to thrive.

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