We recently purchased a Nutribullet Select. Great product but now wanting to know if we can use to puree vegetables and fruits for baby food (don't want too runny). We boil the carrots or sweet potatoes and let them cool then blend but found that pieces get stuck down the blade end and the food does not rotate around the cup. Is there a better way to do this in the Nutribullet? I assume we should always add some liquid such as water before blending? Or some type of baby stock etc?