The excessive GWG was significantly associated with: prepregnancy BMI, BMI at delivery, obesity degree, DM, AIMS pronation and supination scores (p < 0.001), positive family anamnesis (p = 0.026), HTA (p = 0.004), anemia (p = 0.001), drug use in pregnancy (p = 0.003), complications at delivery (p = 0.050), BPD fetal (p = 0.043), AC fetal (p = 0.017), EFW (p = 0.010), Apgar score in 1 min (p = 0.047) and 5 min (p = 0.016), HGB before delivery (p = 0.019), HGB after delivery (p = 0.006) and glucose after delivery (p = 0.009) (Table 3). The gene discussed is CYGB; the disease is anemia (phenotype).