Initiation and Duration of Breastfeeding in the Maternal Outcomes and Neurodevelopmental Effects of Antiepileptic Drugs Study.

BACKGROUND AND OBJECTIVES: Breastfeeding has important health benefits for both mother and child. We characterize breastfeeding initiation and duration in mothers with epilepsy relative to control mothers in a large prospective cohort.

METHODS: The Maternal Outcomes and Neurodevelopmental Effects of Antiepileptic Drugs study is a prospective, multicenter observational, US cohort study. Pregnant individuals with and without epilepsy, aged 14-45 years, were enrolled between December 19, 2012, and February 11, 2016. Exclusion criteria included intelligence quotient (IQ) <70, and gestational age >20 weeks at enrollment. Breastfeeding was assessed through electronic diary and at study visits until 2 years postpartum. Odds of initiating breastfeeding was compared between cohorts using unadjusted and adjusted logistic regression models. Duration of breastfeeding was compared between cohorts using the log-rank test.

RESULTS: Three hundred fifty-one pregnant individuals with epilepsy and 105 pregnant controls were enrolled. Breastfeeding data were available for 325 mothers with epilepsy and 98 controls. Study cohorts were similar demographically except race ( p = 0.008); 84.9% of mothers with epilepsy and 71.4% of controls were White. The mean IQ was lower in mothers with epilepsy compared with that in controls (97.7 vs 104.2, p < 0.001). Breastfeeding was initiated by 74.8% mothers with epilepsy and 88.8% controls; this difference was significant in unadjusted logistic regression (odds ratio [OR] 0.4 [95% CI 0.2, 0.7], p = 0.004), but not in adjusted model (OR 0.5 [95% CI 0.2, 1.0], p = 0.051). Factors associated with breastfeeding were higher maternal education and IQ. There was no difference in duration of breastfeeding between mothers with and without epilepsy (median duration 8.5 months vs 9.9 months, p = 0.793). Among mothers with epilepsy, both convulsive seizures and all seizures that impair awareness during pregnancy were associated with lower breastfeeding initiation (OR 0.4 [95% CI 0.2, 0.8], p = 0.013) and (OR 0.4 [95% CI 0.2, 0.8], p = 0.003, respectively). Any peripartum seizures were associated with shorter breastfeeding duration (median 6 months vs 9.7 months, [ p = 0.040]).

DISCUSSION: Mothers with epilepsy were less likely to initiate breastfeeding compared with controls; however, this difference was not significant when controlling for maternal IQ and education level. Continuation of breastfeeding once initiated was not different between mothers with and without epilepsy. Seizure control was associated with breastfeeding initiation and duration in mothers with epilepsy.

TRIAL REGISTRATION INFORMATION: ClinicalTrials.gov identifier NCT01730170.