In infancy, lack of appropriate growth for no known medical cause that is accompanied by poor developmental and emotional functioning is known as .

The correct answer is:

Nonorganic Failure to Thrive (NOFTT)

Explanation:

Failure to thrive (FTT) is defined as decreasing growth rate of an individual or the weight of less than the 5th percentile.

Nonorganic failure to thrive (NOFTT)as described in the question is lack of appropriate growth for no known medical cause that is accompanied by poor developmental and emotional functioning in infants (usually less than 2 years old). This can be caused by several factors, but most associated cause is linked to a mother or primary care giver neglecting the child in terms of proper feeding feeding. This feeding deprivation, can occur when the primary caregiver is; emotionally unstable, ignorant on proper feeding habits, or fails to identify the child's need among other things. Another cause is a maladaptive interaction between child and caregiver, causing a heightened emotional tension. Because of the association between the parental neglect of the child and the development of NOFTT, it has been described as maternal deprivation syndrome. Some unfavorable qualities in the child can also decrease the mother's interest in caring for the child. Some of these qualities include, frequent crying, not showing response to affection, unattractive appearance, etc. Some other factors may contribute to NOFTT, and they include poverty, drug abuse, eating disorder, demanding jobs, illitracy, mental disorder etc.

On the other hand, Organic failure to thrive is lack of appropriate growth with poor developmental and emotional functioning associated with medical conditions such as; malabsorption, or other inborn errors of metabolism that interfere with nutrient intake.

Finally there is also the mixed failure to thrive which is a combination of nonorganic and organic failure to thrive.

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