That depends on age and what she thinks he will need. You will likely be evaluated by your state early intervention program, but do not rely on that alone. Always get as much private therapy as you can afford to supplement state services. You will most likely be refered for Occupational therapy and Physical Therapy from what you are describing. She may also do a full physcial work up because of his low weight, and could make a referal to a Developmental Pediatrician (your VERY best bet.)
I would caution you to be very vigalant about every single milestone from here on out, and do not take any time to "wait and see" if he fails to meet one. Do some reading about early child hood development so that you know what is a typical time line, and what is not so that you do not miss anything. Go sooner rather than later, get more intervention rather than less. Getting intervention early is by far, hands down, the most effective thing you can do for him. You should over do rather than to risk missing something.
Pay VERY close attention to his speech development and get a speech and language evaluation at the fist hint of a problem.
Hope that he is doing well by the next visit, but don't panic if he is not. Even if he needs intervention, it is not the end of the world, and you are getting started very early.
M.