Protein shakes aren’t recommended for children, even teens, because they can lead to health problems down the road. Kids who consume one or two daily servings of lean proteins like chicken, beef, or pork, as well as two servings of dairy products, should be fine. Children 4 to 9 years old need about 19 grams of protein per day. From ages 9 through 13, it’s 34 grams each day. Teenage boys do need more than girls: 52 grams and 46 grams, respectively. But in Western society, these totals should usually be achievable through diet.;