As long as you're visiting, it won't be. Many people visit more frequently than that (some of my ex-colleagues used to pop over the border from Vancouver every other week).
The main concern from the immigration folk is that you're not 'visiting' - ie you're planning to stay, or are otherwise beating the system. If you have your travel plans documented, names and addresses of people you're staying with (or hotels), and proof of your intention to depart again (flights etc), everything will usually go fine.
That doesn't mean you won't get questioned - I used to often get asked about the last time I was in the US, but as long as you're honest and open, there should be no problem.