I brought my DS to DW at 5 weeks old. We have season passes and they were expiring in two months. I knew that once I got back to work from Maternity leave, I would have no more time off. I confirmed with my dr and his pediatrician before going. They both gave me the all clear but warned me of the precautions to take with him. One example, I didn't change him in the restrooms but in his stroller so that he wouldn't be exposed to anything there. I held him on rides then washed our hands when we got off. This was October of last year and he has had no illnesses as a result of this. DW does a great job of cleaning there parks. I think if you are comfortable with it, go for it. While we were there this last trip, we saw an 8 day old at DW.