Different batches of milk powder will have subtle differences in taste and color due to the climate and season of the milk source, which may lead to a little difference in smell. Dutch cowshed milk powder is rich in vitamins and various trace elements, so it has a sour taste. At the same time, because the added DHA is extracted from deep-sea fish oil, deep-sea fish oil generally has a little fishy smell, so it smells fishy. Together, these two flavors may cause more sour taste, but it is normal to have these flavors.
Adults and infants have different feelings and sensitivities to taste, so there is no need to worry too much that infants will not adapt to this taste. In fact, as long as it is purchased through formal channels, there is generally no need to worry too much about quality problems.