Table 3.

Conception via fertility treatment and subsequent feeding practices during infancy, associations identified in the Upstate KIDS study (2008-2010)

Model	Unadjusted N=1,361		Adjusted^a N=1,361		Adjusted ART treatments only N=649		Adjusted OI/IUI treatments only N=712
	RR	95% CI	RR	95% CI	RR	95% CI	RR	95% CI
Breastfeeding until
4 months^b	1.01	0.88, 1.17	0.92	0.79, 1.07	0.82	0.66, 1.03	0.97	0.80, 1.17
8 months	0.78	0.62, 0.99	0.82	0.64, 1.04	0.93	0.67, 1.31	0.73	0.54, 1.00
12 months	0.62	0.44, 0.88	0.58	0.40, 0.86	0.47	0.25, 0.88	0.67	0.42, 1.06
Providing formula at
4 months	1.10	1.02, 1.19	1.22	1.11, 1.33	1.25	1.09, 1.44	1.20	1.09, 1.33
8 months	1.09	1.01, 1.17	1.07	0.98, 1.15	1.04	0.89, 1.21	1.09	1.01, 1.17
12 months	1.00	0.84, 1.19	1.03	0.85, 1.25	0.85	0.62, 1.16	1.15	0.92, 1.44
Providing solids at or before
4 months	1.08	0.97, 1.19	1.17	1.05, 1.31	1.28	1.09, 1.50	1.12	0.98, 1.28
8 months	1.03	1.00, 1.06	1.01	0.98, 1.04	1.03	1.00, 1.05	1.00	0.96, 1.05
12 months	1.02	1.01, 1.02	1.00	0.99, 1.01	1.00	0.98, 1.01	1.01	1.00, 1.02
Providing juice at or before
4 months	0.81	0.57, 1.17	1.44	1.00, 2.06	1.24	0.73, 2.12	1.56	1.01, 2.40
8 months	1.06	0.89, 1.26	1.15	0.96, 1.37	1.03	0.73, 1.47	1.20	0.99, 1.47
12 months	0.92	0.82, 1.03	1.00	0.88, 1.13	0.97	0.77, 1.23	1.01	0.88, 1.17

N=number in exposed/treatment group; RR=risk ratio; CI=confidence interval; ART=assisted reproductive technologies; OI/IUI=ovulation induction/intrauterine insemination; intervals in bold are statistically significant at p=0.05

Adjusted for maternal age, race/ethnicity, BMI, education, marital status, private insurance status, prior births, morbidities, seeking medical help for fertility in the past, and paternal age, race/ethnicity, BMI, and education (all models)

Corresponds to the targeted timing of postpartum questionnaires