Well sure, in an ideal world we'd ALL have a years worth of income saved up for emergencies. But not everyone is able to do that, or their emergency funds were eaten up by other emergencies and the death happens before it can be replenished. Heck, DH and I are in the process of getting a years worth of expenses (not income, just bare bones expenses) saved up and I figure it will take us three years to do so, and we've got extra room in the budget to do that. A lot can happen in the time it takes to get savings established. As the saying goes, "life happens when you're busy making other plans".
I agree Gerber and other whole life policies aren't the way to go, but I see a lot of wisdom in getting a cheap term policy for children, or as another poster suggested, adding them as a rider to the parents term policies, especially if you don't have much in savings.
Lets say you can get a 20 year term policy on your child for $5 a month for $20k worth of coverage. In twenty years you'd spend $1200. If the worst happens and your child dies, you've got one less thing to worry about. If things turn out fine and you never need it, then you're out $1200. On balance, that doesn't sound like a bad deal to me.