The two formulas are much the same, but the TC 3 has added Omega 3 and 6 and additional minerals and iron and prebiotics which support the growth of good bacteria in the digestive system. It is a so-called growth formula. Your son is eating a very good mixed diet so he only needs a maximum of 2 cups of milk a day. Seeing that he is eating yoghurt and cheese his calcium intake is good. So he can use the Similac TC 2 until you can get the TC 3 again.
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