Getting Fur Baby ready for little brother

Kie • Blessed and Highly Favored! 👫💍👼🏽🐩🏡🎓
Any suggestions on how to get your fur baby ready to a new baby?? My 4.5 lb poodle is rotten and loves mama... His attachment is really bad to me. He has been acting out a little and crying . We want to make it a smooth transition for him too.