I sure wouldn't put the health of my baby in the hands of the keyboard experts .
you say the attic is sealed off from the house , if so why do you care about bugs being up there . ladybugs and even yellow jackets play an important role in the environment .
if they are coming into your living space the attic is not sealed as well as you think it is .
so my opinion is no . don't do it .
The ladybugs (lady beetles) we have play no role in the environment because they are not part of it. I find that if you go in the attic when it is really cold, you can find them in several big knots. You can spray them directly, or a chemical free option would be to vacuum them up and then set the vacuum outside in the cold so they can freeze to death.Be aware that if you use the vac, there will be a repulsive odor, and you will want to make sure and seal the ends so they cant get out while you come through the house. Either way, kill those nasty things, ladybug in diaper, ladybug flying into mouth, ladybug down sippy cup hole, ladybug mistaken for food, leads to lots of screaming.