from what age can i start giving health drinks to babies??and which ones are good to give?

You can give home-made smoothies to your baby probably after 1 year old, once they have tasted most of the fruits and vegetables, and understand what to avoid in case baby is allergic to it. It is very nutritious as no preservative or addictive in home-made smoothies. You can get some ideas from here: http://wholesomebabyfood.momtastic.com/babysmoothiesrecipes.htm