As when you were pregnant, you can include fish and seafood two to three times a week, but avoid fish with high mercury levels. (babycenter.com)
Just like during pregnancy, nursing moms should avoid or limit their intake of fish high in mercury, since high mercury levels can damage the developing nervous system. (kidshealth.org)
I sometimes eat 2 cans of tuna per day, making concerns over high mercury levels of significance for me. (safecatch.com)