In summary, our study shows that obese women, although gaining
significantly less weight than non-obese women, have a GWG above
the value recommended by the IOM and that such excessive GWG increases
the risk of macrosomia. Women in obesity class II and III with
a GWG in line with the recommendations gave birth to heavier children
than did non-obese weight women, indicating that GWG recommendations
should be stratified according to obesity class. Further studies are
needed to evaluate the IOM GWG recommendations and their implications
for obesity classes II and III.