How do you know when and how much solid food to feed your baby? He's 4.

By 4 years old, I feel that it's important to establish a regular meal time. Here is a menu sample that I got from the article that I've linked below. BREAKFAST - 1 small whole-wheat bagel spread with 1 tbs. nut or seed butter - 1/2 cup fruit salad LUNCH - 1/2 turkey-and-cheese sandwich on whole-wheat bread - Yellow pepper strips with 2 tbs. low-fat ranch dressing - 1/2 cup sliced strawberries DINNER - 2 oz. fish (such as cod or tilapia) - 1/2 cup cooked brown rice - 4 asparagus spears roasted in olive oil SNACKS - 1/4 cup hummus and 10 baby carrots - 1 small box raisins When my daughter was 4, she eats when we eat, no exceptions so she knew that if she missed any meal time or doesn't finish her food, there's no food until the next meal time. Here's an article for better understanding: http://www.parents.com/recipes/nutrition/how-much-does-my-kid-need-to-eat/