You can make fruit puree from both fresh and frozen berries, such as raspberries, blueberries and wild berries.
You should always boil frozen berries before giving them to the child. You do not need to cook fresh berries before mashing them, only wash them thoroughly.
Fresh mash can not be stored, but must be eaten immediately.
You can store boiled mash in the refrigerator for a few days. If you want to store boiled fruit puree, it is best to freeze the puree, as the berries thereby preserve the vitamins best.