I think a lot of previously active women think they are expected to stay at home like their mothers did and nothing makes them grumpier than watching the bloke go and have fun while they sit on the floor with the kids. They just get more tired, grumpy and bored. When they're in that routine and you stay home and say you'll do whatever they want, you end up sitting reading the paper in conpanionable silence.
(Don't ask me how I know)
My wife crewed the 5.8 last year and now crews the 5.7 and we have heaps of fun together. Now she's grumpy with me when my mate comes down to sail the big races. Let the grand parents hold the kid while your racing, let her know she's not a boring slob because she's had a kid and you need her company every Saturday.
If that doesn't work get a Blade F16, the one that sailed here last weekend was unbelievably fast just behind the F18 Infusion well ahead of me and looked hot on the water.
regards