Welcome! I hear that you want to explore... that is fine.
But I'm lookin around for any and all infowtion I can find to help mostly myself ease into this a little better. I don't think in going about it the right way.
It isn't just you in the potential polyship. He is there too -- is he wanting to go about it in the right way? what IS the "right" way to you both? What are you wants, needs, and limits?
Have you considered how to to avoid pitfalls
Esp since you still have insecurities to address.... how is that offering yourself as the best dating partner you could be?
Could examine your plan for HOW you want to explore... is this the best time to implement a dating phase? Already explored everything else? Like reading resources together?
The kids would be in the polyship too. They are your dependents and you have commitments to these people already, too right? Not just the spouse person?
With a new baby on the way you are ALREADY adding a new person to your potential familymath/polymath dynamic
. That's one load of stress. To add him dating? That's another load. To add you dating? That's another load. To add you and him dating the SAME person? That's another load. Could choose to take things on board at a slower pace to not go into in "already on overload." Maybe some careful "Openings" rather than full on "Open?"
You can polyship with young kids -- but it requires careful thought. The stresses could affect them -- esp with time management. You guys could create the DIY plan to serve ALL of your family's needs best.