New Responsibilities, New Bankroll, what to do to try to build

A quick dilema. I recently came back from a Vegas trip and did fairly well. I came back about a $900 winner playing 1-2 NL. Well, I have a new baby that is 2 weeks old and feel kind of guilty reinvesting my money. I would like to put some of this online to try and build more bankroll without feeling like a complete selfish "you know what". Does anybody have similar experience or any advice?