Definitely! I'm currently nursing my youngest, and I'm planning to tandem nurse them unless my LO decides to wean if/when my supply drops off.
For the poster who commented on being nervous - I STRONGLY suggest you find a La Leche League group near you. It's a great way to meet other mothers, pregnant moms are always welcome, you will be able to get some questions answered, and the Leaders will be able to directly and calmly address your fears and concerns. There can be a bit of a learning curve, but barring medical contraints, most babies and moms can nurse successfully. Please don't worry!!