This isn't really SBS related, but the Daddytypes.com blog had an interesting post on design awards for a baby bottler holder and a baby pram.

In one case, they did something useful and in the other, they didn't...

As anything which makes caring for a child more frustrating can increase the potential for a parent or caregiver to lose control - frustration is cumulative - I suppose good - and bad - design is related...