Boma has the standard kids section that most Disney buffets have: chicken strips and fries, pasta, meatball, sauce, etc. I don't think I've ever seen pizza there, though.
However, as the PP mentioned there are good choices from the rest of the buffet -- roasted chicken, rice, fruit, salads. And the dessert section is perfect for children. Lots of small bites like zebra domes, fruit tarts, cookies, brownies, etc.