I fed my first babies too early and fried them - live and learn. I am a newbie - obviously or I would not have killed my plants ..LOL...but I have heard you should wait at least 4 weeks until you feed. Other people say wait until you have 4 or 5 nodes. Whatever you do, don't feed too soon. When you do start feeding, they like high nitrogen when they are in the Veg stage. Hope this helps!