nan optipro three

Goodmorning mamshes.I used to buy nan optipro three 2.4 kg.to my 1 yearold and 4 months child.Since there is no available 2.4 kg.i purchase 1.8 kg.Sad to say my child didnt drink it because it tastes like malansa and makalawang yung 2.4 kg himdi nman sweet nga sya na parang milk lng but this 1.8 kg bkit gnon na ang lasa?Expiring on aug.2021 pa nman.huhuh.why is it so?Please shate your experiences po.