TABLE 3.

Estimated infant lithium serum concentration during exclusive breastfeeding.

Time postpartum	Number of serum lithium analyses available	Mean [Li] (mEq/L)	95% CI (mEq/L)	% Change from baseline	95% CI
Baseline (delivery)	8	0.43	0.32 to 0.55	-
T1 (3 ± 2 days)	9	0.41	0.33 to 0.49	−6.31	−2.28 to −15.16
T2 (9 ± 2 days)	5	0.29	0.21 to 0.36	−33.45	−24.43 to −42.45
T3 (30 ± 5 days)	6	0.24	0.15 to 0.34	−43.80	−38.35 to −43.88
T4 (60 ± 5 days)	4	0.19	0.12 to 0.27	−54.99	−45.56 to −65.13
T5 (≥90 days)	5	0.18	0.15 to 0.20	−58.52	−38.33 to −78.90

Abbreviations: CI = Confidence interval; T = time.