Congrats and welcome to the Barn.
Don't want to rain on your parade but I hope you have seat belts in the rumble while taking the kids for a ride. Rumbles are dangerous for everyone, especially small children.
From my past posts, I can be labeled a seat belt campaigner and this is true. In addition to rumble seat belts, an adjustable strap with rubber coated hooks on each end, one attached to the cross bar under the rear and the other hooked over the rumble lid handle will prevent the lid from closing on the occupants in case of an accident. Costs about $10 at big box stores and can be installed or removed in seconds.
I have installed three point retractable belts in the driver's compartment and lap belts in the rumble of our roadster and we ride with kids in the back often. PM me if I can be of any assistance on belt installations.
Good luck with your new baby and drive it often!
Glen