M.L.
If it's just your baby that's waking up earlier, maybe have your husband put him down at the same time as your 4 year old? That way he wouldn't have to lose any sleep and neither would you.
I know it's hard for people who haven't dealt with DST before, but everyone else in the country has been doing it for years. Since I wasn't raised in Indiana, I've had to deal with DST all my life. The first day or so, maybe more for the kids, can be a little rough while you adjust, but an hour isn't that much. It's just like a little bit of jet lag. Your body quickly adjusts.
This strategy is a little late for this year, but next year you might want to try adjusting the kids a little bit at a time over the week before the clocks change. That way their sleep schedules aren't disrupted.