Serving size of 1cup (28g) Cereals, fortified (ready to eat) has 0.400mg-1.500mg vitamin B1 which is 28-107% 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 B2, and vitamin E. 

The vitamin content in each specific cereal can very largely, so pay attention to the manufacture food label for details.