MyLee by MyMilk Labs
Serving size of 1cup (245g) yogurt (low fat) has 1.370mcg vitamin B12, which is 48% of the daily vitamin RDA for lactating women.
Yogurt (lowfat) can also be a good source for other priority 1 nutrients for lactating women such as Vitamin B2 and Iodine.
Find a recipe with yogurt here