im in the navy and me and my wife are getting a annulment after 5 months together

First you should know that annulments are only granted for very limited specific grounds, such as that you found out your wife was a prostitute or felon prior to the marriage and she didn't tell you.  Nothing you have stated is grounds for an annulment.  However, it sounds like you suspect adultery, which is grounds for a divorce, if you can prove it (which is virtually impossible). As for your questions about child support and BAH, you should not have to pay any child support for a child that is not yours and whom you did not adopt.  Your wife could ask for spousal support for herself, however, and that could include your BAH.  But we would have to look at a number of factors more closely to determine what, if anything, she may be entitled to. This answer is given in accordance with the laws of Virginia and may not be applicable in any other state.  It should not be construed as legal advice, as that would require a more thorough analysis of all of the facts involved in a specific case.  If you need further information or assistance, please feel free to contact my office for a consultation. Case results depend upon a variety of factors unique to each case. Case results do not guarantee or predict a similar result in any future case.