What I always find interesting is the approach that children are happier when mom is more "fulfilled" or "happier" by working. Same rationale for many divorces... from my own observation, I can say with great certainty that my two children are happy with me at home and my personal fulfillment or professional satisfaction is below zero on their list of priorities! They just want mommy, and how lucky I feel to be here with them.
Mommy...oh how I love that word. Yes, you are lucky to be there with them and nothing else matters to them in this world except Mommy being with them. You know it's important. The kids feel it but don't know why. Doesnt' matter...the important thng is they love having you there.