I was wondering if anyone knows how much salt (...

I was wondering if anyone knows how much salt (sodium) toddlers can have and if foods in brine (like olives and capers) contain a lot of sodium? My DS doesn't eat salty snacks like chips much, but does eat things like Arnotts shapes which I imagine a high in salt, but he LOVES olives and I give them to him daily in his lunch box and for dinner, but am starting to worry about the amount of salt he is eating. Any ideas?