Since mom was unaware the baby was gone, I'd hazard a guess that you entered the dwelling in an unlawful manner and likely at an hour that everyone was asleep. There's a potential criminal charge right there.
As others have intimated...you may have just seriously damaged any case for custody you have. I'd imagine any visitation you will get will initially be supervised (for a long time) and there may be a permanent bar on any out-of-jurisdiction travel with the child. You have now given your wife an amazing example to show the court. If she's smart, she will at least file an informational report with the local police to document your stupidity.

