Serving size of 1cup (28g) Cereals, fortified (ready to eat) has 0.400mg-1.700mg vitamin B2 which is 25-106% of the daily vitamin RDA for lactating women.
Cereals, fortified (ready to eat) can also be a good source for other priority 1 nutrients for lactating women such as Vitamin B6, Vitamin B12, provitamin A (RAE), Vitamin B1, and vitamin E.
The vitamin content in each specific cereal can vary largely, so pay attention to the manufacture food label for details.
Find a recipe with cereals here