Introduction:

At the present time it exists, a parallel global epidemic to the pandemic of obesity; given by normal corporal weight and high levels of general adiposity. Their identification like phenotype of obesity allows predicting risks that can affect the development of the pregnancy.

Objective:

To determine the anthropometric and metabolic features those distinguish to the obese normal weight pregnant and their relationship with the newborn size.

Methods:

An observational analytic traverse study was conducted. Of a population of 526 seemingly healthy pregnant in optimal reproductive age, a sample of 358 metabolically healthy ones was obtained, that was stratified in 163 normal-weight healthy (HNW) and 195 obese normal-weight phenotype (ONW), in those anthropometric, metabolic and ultrasonographic variables was studied and the newborn condition. Theoretical, empiric and statistical methods were used.

Results:

The phenotype ONW in pregnant showed superior securities of WC, Index WC/H, % BF, Sum of tricipital and subescapular skin folds and of the LAP. In them the subcutaneous and pre-peritoneal fats were superior and they had bigger frequency of big births for the gestational age.

Conclusions:

The phenotype ONW in the pregnant is distinguished for anthropometric, metabolic and ultrasonographic features of central obesity and it is associated with the Big babies for the age gestacional at birth condition.

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