As my pregnancy progressed, it became clear that she loved babies. And also that she didn't get jealous or have any issue with me holding other babies. Obviously that's different than me having a baby and bringing him home, but it was a promising sign.
I spent a lot of time thinking about how to prepare her for a brother. She's only 19 months old, so there's only so much talking we could do, but we tried to tell her all about her baby brother before he was home. She caught on pretty quickly, but still I wasn't sure how much she really understood. She liked all the baby's toys and blankets and things in his nursery, but did that mean anything?