Calcium intake

Dear Kelley,

how much Ca for a 4 year old? He eats no dairy except plain organic yogurt (due to eczema). He gets home cooked food 90% of the time, used to eat more vegies but lately he's more picky, so he eats broccoli(3x a week), rarely cauliflower, bell pepper, and bok choy.
He loves almonds, but they seem to be a bit difficult for him to digest, his buttock becomes a bit itchy and his stool is sometimes (after eating nuts) pale colored.

I'm not abig fun of supplements for kids, the only thing I give him is homeop. Vit C.
Could you please state your opinion, wheather it's enough what he gets on Ca, or do we need to do some adjustment.

Thank you.
Suz.