The fact that he is crying the way he is and then shakes his hands and arms frantically at the sight of a bottle or food, then sucks it down as if he's not eaten in weeks, is a sign that he is unreasonably hungry. If he didn't cry like he does and didn't react like that, then I would say, that's just his feeding schedule and the foods he eats. But going by his behavior, he's excessively hungry and needs more food.

Then, since his mother finally admitted to me that they have been feeding him stage 3 food and table food at home, but only send me stage 2 food completely proves that he is used to more substantial food and truly is hungry here.

Reply