How to give blueberry for 7m old baby?

You can try to follow the recipes in this article: http://wholesomebabyfood.momtastic.com/blueberrybabyfoodrecipes.htm The simplest is the first one which is the Stewed Blueberry Puree. Add blueberries into boiling water and simmer for 15 mins or so. Transfer the blueberries into blender/food processor and puree. Cereal could be added for thicker texture.