Answer: D. Yes; levels of Tamiflu in breast milk are so low that the newborn will not receive a clinically significant dose.
The answer is yes, but data are sparse. In a study on exactly one subject taking the standard adult twice daily 75 mg dose, the maximum level of active metabolite in the breast milk was such that the relative infant dose was 0.5% of the maternal weight-adjusted dose. The CDC has recommended/approved Tamiflu’s use in breastfeeding moms.
Hale T. Medications and Mothers' Milk. 15th Edition. Amarillo, TX: Hale Publishing, LP; 2015.
Centers for Disease Control and Prevention. Guidance for the Prevention and Control of Influenza in the Peri- and Postpartum Settings. http://www.cdc.gov/flu/professionals/infectioncontrol/peri-post-settings.htm