BMI during pregnancy and its relationship with the weight of the newborn

An analysis of the literature was carried out whose main objective was to evaluate the influence of the Body Mass Index, pregestational and gestational, on the weight of newborns. We designed a systematic review of observational studies (retrospective, cross-sectional or prospective), fulfilling the guidelines of the review protocol Preferred Reporting Items for Systematic reviews and Meta-Analyses (PRISMA). The protocol was registered on the PROSPERO website, and it was assigned the registration number: CRD42017080707. We searched by applying the inclusion criteria in the following electronic databases; Pubmed, Scielo, Cuiden, Google Scholar and Scopus. We identified 372 articles that met the inclusion rules. We carried out a screening in duplicates, reading the title and abstract of the identified articles, and subsequently an in-depth reading of the articles, 10 articles were included in the present systematic review. Once the articles are analyzed, it is observed in the results that the BMI is positive and significantly related to the birth weight of the children. Thus, mothers who begins gestation with low weight have a greater risk of conceiving children with low birth weight for gestational age, just as obese and overweight women have a greater risk of having macrosomic children. No data have been observed that relate the weight of newborns of women with normal weight, with the weight gain of mothers