Yes, canned tuna can be eaten during pregnancy, but it should be consumed in moderation due to concerns about mercury contamination. Pregnant women are generally advised to limit their intake of canned tuna to about 2-3 servings (8-12 ounces or 225-340 grams) per week, preferably opting for canned light tuna, which tends to have lower mercury levels compared to albacore or white tuna. Consuming canned tuna within these limits provides beneficial nutrients important for fetal development, such as protein, omega-3 fatty acids (EPA and DHA), vitamin D, iron, and vitamin B12. However, excessive consumption should be avoided to minimize risks to the baby's brain and nervous system development from mercury exposure.