^ Harry was only 17 when Tonks and Remus died - that's far too young to take responsibility of a baby, especially considering Harry is finally able to live a free life. Being godfather doesn't automatically make Harry Ted's guardian - I suspect Andromeda is Ted's guardian, and she is the best suited since she has just lost her husband and daughter, all she has left is Teddy. Only when she is unable to look after him would Harry take full responsibility of Teddy.