If you were married, and money went into his 401(k) during the marriage, it is (probably) community property and you're entitled to a share of it, along with your share of any other community property.. If you and he had children during the marriage, he has an obligation to contribute to the support of his children.
Your new child has NO effect on EITHER of these facts.
If you were married, and a stay-at-home Mom, and he makes more than you, you're PROBABLY entitled to some spousal support (what used to be called alimony) AND you're probably entitled to ask the court to order him to pay part of your attorney fees.
You should speak to an experienced family law attorney about protecting your, and your children's rights.
I agree with the answer and analysis by Mr. Richard Gould-Saltman. I would add that you likely have child support rights against the person that is the father of your more recent child. Child support is based upon paternity - not marriage.
BTW there is a presumption that a child conceived during a marriage is the child of the married people. Given your post that you became 'pregnant not by him' if you were to attempt to rely on the presumption (which you know to be false) pursuit of child support from your ex-spouse will likely be an actionable fraud and if court papers 'filed under penalty of perjury' are submitted that are fraudulent, then such conduct is actionable against you as a crime.
Again, speaking with a family law attorney may not get clients the money they seek but results in the avoidance of seriously adverse consequences.
More information helpful for your situation is available here: http://singleparents.about.com/od/fileforchildsupport/a/child-support-and-unplanned-pregnancies.htm
Best of luck to you and your new baby!
As stated above, this is an incomplete answer but an attempt to provide a cursory overview of a subject that attorneys 'practice' and improve upon during the entirety of their legal careers. This response is not meant as legal advice or as a legal opinion. Such advice would be impossible or impractical without additional information and more facts giving rise to the question. A consultation with an attorney is necessary.
My colleagues have provided you with solid information. IF you did not have the assistance of counsel during the divorce process, I suggest that you seek that assistance now.
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