One limitation of the present study was that the GWG entries in the
database relied on self-reported data from the patients’ files. It has
previously been shown that self-reported pre-pregnancy weight can be
underestimated, which leads to an overestimation of GWG [24]. GWG
was calculated the same way in all groups in the present study, but
no data are available showing whether obese women preferentially
overestimated or underestimated their pre-pregnancy weight. Another
limitation was that weight at the end of pregnancy was the last entry,
but it could have been measured at any point between 35 weeks to delivery.
Weekly weight measurements are officially recommended from
38 weeks of pregnancy on, but both healthcare professionals and patients
are reluctant to practice this, probably to avoid embarrassment