Introduction:

Failure to thrive is the inability of a child under 3 years of age to achieve optimal development and growth. It is often confused with the normal variants of child growth and development.

Objective:

To examine the normal variants of infant growth and differentiate them from true failure to thrive.

Methods:

Relevant studies were located and selected in the electronic databases Medline, Virtual Health Library, Google Scholar, SciELO and in digital books. For the search, the words used were: failure to thrive, variants of the normality of growth and child development. 89 articles published between 2005-2020 on related topics were found; 41 were chosen and made up the sample.

Analysis and synthesis of information:

Different aspects of failure to thrive were updated: definition, classification, diagnostic criteria, risk factors, potential causes, diagnostic evaluation and behavior. The clinical characteristics of the variants of the normality of child growth and development that allow them to be differentiated from the failure of growth were examined.

Conclusions:

Constitutional growth and development retardation, family short stature, idiopathic short stature, prematurity, delayed intrauterine growth, thinness and catch-down were normal variants of infant growth that are erroneously diagnosed as failure to thrive and generate unjustified medicalization, unnecessary expenses in complementary tests and family anguish. Differentiating these entities from the failure to thrive would allow health actions to focus on more specific objectives and offer each child an individualized treatment according to their real health condition.

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