You just made a huge change in your life, and your toddler is responding to that by clinging to you a little more firmly. The best th you can do is to continue to nurse him and let him adjust to his new surroundings. As he becomes more accustomed to his new home and more comfortable in his new life, he's going to decrease his nursing frequency. Take him out- the grocery store, the park- and try to make a routine for him. The more he feels that you will always come back, the less clingy he will be.
Coolest thing my big girl said recently: "How can you tell the world is moving when you are standing on it?"
Coolest thing my little girl sang recently: "I love dat one-two pupples!"