Can I know why breast feeding mothers can't have soy sauce?

At what age do you start adding soy sauce, salt, sugar etc into your kids food?
Mums, what do you think: soy sauce or salt to season, if any is used at all?
Frustrated with elders on feeding LO solids Why all the elders have all sorts of funny ideas when co...
mentaiko sauce Can i we eat mentaiko sauce during pregnancy?
Bm better than formula milk? Is bm still better than formula milk even if i dont really eat veg and...
Is there any danger of taking too much soy product while breastfeeding? Recently I've been drinking...
Able to consume while breastfeeding? Teryaki sauce