Doctors testified that Ice was at risk of heart failure or seizures because she was fed only ground nuts, fruit juice, herbal tea, cod liver oil and a liquid mixture of potatoes, sweet potatoes, plantains and fresh vegetables(Vegan Couple Guilty Of Neglect)

I hold no brief for the couple, who seem like nitwits to me. I have no opinion on whether the diet was adequate. I don’t even know why I clicked on the story located on the news page that google generated for me. But now I have two questions.
1) I presume cod liver oil comes from a cod’s liver? How is cod liver oil vegan?
2) Does a vegan diet mean that an infant can’t be breastfed?