Aphids?

[Leezy2]

So I've been fighting cabbage whites all Summer, then flea Beatles and managed both. We've been away for a week and come back to these little critters, all over the sprouts and cabbages. Before I break out the soapy garlic spray, aphids or something else?

[Jungle Jane]

Could be whitefly larvae,can't see in the photo very well. Adults might be on some lower leaves. I've got them too & cabbage white butterfly families,so many holes in everything! Soapy garlic spray works well to get into the brussel tops & wash the whitefly larvae out to the ground.