It is supposed to be like that. Babies over one year old should take only 16 and 20 onces at most. Even if they take no milk is fine as long as they are eating healthy food and good amounts.
My son’s nutritionist said that toddler formula contains more sugar than milk and causes more prone to cavities. Also it doesn’t have that much proteins and nutrients than whole milk. Which is what the baby needs to grow healthy and strong. But everybody is different and choose what is best for you. Hope this helps
https://elsenutrition.com/a/resources/nutrition/toddler-formula-vs-infant-formula?srsltid=AfmBOorOhR0Y8hfSH4lhTu8h9yfrJYLMEnufykRzDc1uMHxst1TsaP4R According to this article and others I read, the toddler formula is higher in fat and sodium content than baby formula. Since it has more fat content I would assume that’s why.