“…The following variables obtained from the baby's birth certificate were assessed as possible confounders: maternal age, race, education, marital status, prenatal care (categorized as adequate, intermediate, or inadequate), prepregnancy body mass index (BMI), gestational weight gain (categorized as appropriate or not appropriate according to maternal prepregnancy BMI), delivery type (vaginal or c‐section), alcohol use, and smoking (Canady, Bullen, Holzman, Broman, & Tian, 2008; Crane, White, Murphy, Burrage, & Hutchens, 2009; La Coursiere, Baksh, Bloebaum, & Varner, 2006; McCoy, Beal, Shipman, Payton, & Watson, 2006; Odendaal, Steyn, Elliott, & Burd, 2009; Stéphan‐Blanchard et al, 2008; Tierney‐Gumaer & Reifsnider, 2008; Wilson et al, 2004). Additional variables were also examined as potential confounders: Medicaid and insurance status, and maternal emotional state during pregnancy measured as one of the happiest times of my life, a happy time with few problems, moderately hard time, a very hard time, or one of the worst times of my life (Rich‐Edwards et al, 2006).…”