Toddler Bday Party w/ Snacks for Adults & Kids
Since it's mid-morning to early afternoon, I would think breakfast/brunch foods. You could do mini-quiches or fritatas cut into wedges, a fruit salad and pastries/breads.
Or you could do a spread with bagels, cream cheese, smoked salmon, etc. If you want to keep it "snacky," serve mini-bagels.
Tea sandwiches would work as well -- make a variety, with chicken salad, egg salad, smoked salmon, etc., cut into quarters.