Whether cereal can be soaked in cold milk depends on the type of cereal. Oatmeal can be divided into three types: raw, quick-cooked and ready-to-eat. If it is raw oatmeal, it needs to be cooked for about 20 minutes. If it is fast-cooked, it will usually be cooked in 3-5 minutes; If it is ready-to-eat, blanch it in boiling water for 3 minutes to soften it. But if you buy fruit oatmeal that can be eaten directly, you can brew it with cold milk, but the taste is not as good as hot milk. There are many kinds of milk on the market, including fruit milk, high calcium milk, skim milk and breakfast milk. It is generally recommended to choose pure milk to brew oatmeal, because pure milk is suitable for most people to drink and its nutritional value is higher than many kinds of milk. In addition, brewing with pure milk will not affect the original taste of oatmeal.