I was wondering if the baby zombie echopet goes as fast as a normal player. Also, can you milk an echopet?
I don't think you can milk an EchoPet. As for the baby zombie, I would assume that it goes either at the same speed as the player, or at a slightly greater speed.
The Echopets always follow you, if they can't reach you they teleport to you, just as tamed animals do. They are the same speed as a normal baby zombie. I think faster than the player.