Table 2.

Multivariate associations between infant's age at maternal return to work and breastfeeding initiation or duration (n = 8,009)

Variable	Initiation	Duration among breastfeeding women (ref: 3 to <6 months)
		<1 month	1 to <3 months	6 to <9 months	≥ 9 months
Infant age at maternal return to work
<10 weeks	0.84 [0.71–0.98]	1.49 [1.20–1.86]	1.28 [1.03–1.59]	1.22 [0.92–1.61]	1.48 [1.10–1.98]
10–13 weeks	1 [ref]	1 [ref]	1 [ref]	1 [ref]	1 [ref]
14 weeks to <6 months	1.52 [1.26–1.82]	0.70 [0.56–0.87]	0.49 [0.39–0.61]	1.16 [0.92–1.46]	1.32 [1.02–1.70]
≥6 months	1.85 [1.54–2.22]	0.87 [0.69–1.08]	0.59 [0.47–0.74]	2.03 [1.61–2.57]	3.49 [2.75–4.44]

Note. Values are multivariable odds ratios (95% confidence intervals), also adjusted for infant characteristics (sex, birth weight, and birth order), maternal characteristics (age at first child's birth, parity, country of birth, education level, pre‐pregnancy BMI, and smoking status), paternal characteristics (age difference with mother and presence at delivery), family type (traditional, step‐family, and single parenthood), family income, previous maternal breastfeeding experience, or study design‐related characteristics (maternal region of residence, size of maternity unit, and recruitment wave).