Having another baby can be an adjustment as well as a learning experience for the entire family.  Jealousy can set in when so much attention is on the new baby, especially if you have an only child.  By starting early on, some of that might be alleviated with just a little extra attention.  The perfect chance to do this is while doing your BabyPlus prenatal lessons.  Just muffle the sound with a pillow and take the time to read to the brother or sister-to-be or use it as a time to learn numbers by having them count the “heartbeats.”  It’s also a great time to sit and talk with them about having a new brother or sister.  Help promote sibling bonding even prenatally while in the womb.  It may not eliminate sibling rivalry completely but might help encourage the relationship in the long run.