GPT and gestational diabetes: Before adjustment, in the total effect of ALT on LGA, the indirect impact of GDM on LGA was 0.0023 (95% CI: 0.0007–0.0046); In Model 2, GDM also has a significant indirect effect on LGA (β = 0.0023, 95% CI: 0.0011–0.0054); In Model 3, GDM also had a significant indirect effect on LGA (β = 0.0025, 95% CI: 0.0012–0.0056) (Table 5).