Dayahe, I give my baby egg, crushed nuts, coconut milk, coconut cream,sunflower seeds, lentils, bean soup. Will add if I can think of more. However, we are not vegetarian but that is the non-meaty proteiens she eats. We do do diary, so she has had full cream yogurt.
Can you perhaps give us more detail? Is your baby allergic to certain proteins, is he on soy milk or cow's milk formula?
If you are ok with giving egg, I believe that can be done from about 9 months. Most nuts are advisable to be left until later, but it is controversial.
Vegetarian protein for a 10month old
