I'm due in August with my first bub, a complete beginner in all this parenting stuff and am struggling to find useful info online. I like the idea of using gro-bags for sleeping to avoid having to use sheets and blankets, but am unsure how they work while bub is still swaddled? Do you just swaddle (no blankets) until they lose the startle reflex and then move to gro-bags? Or do you swaddle them under a gro-bag? Or do you have to use blankets over a swaddled baby? Help me to understand!