We have a tiny bit of cradle cap here but I'm so anal about it that its v v little now. His bloody ears are a pain in the arse though - I seem to be forever cleaning them and moisturising behind them. How do a babies ears get dirtier than my own??
My DH does about 50% as you all know but I'm the first to admit that its not me that created that situation so I'm not giving myself much credit. It was a combination of circumstance (Dad being in hospital and then nursing him at home) which meant I literally had to hand him over every day, DH himself not wanting to be at a loss with his own baby, and DHs job which he does from home a lot so he's around a good bit. Oh, and we had to switch to bottles after a couple of months so he can do loads of feeds, which also means he can feed DS to sleep i.e. Bedtimes. So a fairly unique environment, really.
But even then the first few afternoons I came back from being with Dad in the hospital I'd come back to a frazzled DH who had a screaming baby for an hour and a half. I'd feel AWFUL! But I had to go the next day and the next and I had no flipping choice, and after 3 days DH was saying "It was better today". And over the next few weeks DH got his technique sorted. Its not really the same as mine but Ds recognises it now and naps/settles for him just the same as for me.
DH says now that the whole period when Dad was dying was good for him as a father as it really developed his confidence. He says he basically became a father properly during that time when I was busy elsewhere.
So I think the fathers who do little actually need more exposure, not less. I'm the first to say though that I'm a big softie who avoids hassle, so had my circumstances been different (or DH been different) I'd be "sparing" him a lot and ending up creating a rod for my own back. And I also think that breastfeeding really makes it harder to get anything like the same level of parenting.