"Welcome with Love" is so wonderful! My son was 19 months when my second was born. He loved the book, as did my then 8-yo step-son. I loved seeing a mom "slow dancing" with her husband in labor, birthing upright, talking about how it's OK to make noise, how important walking during labor, tastefully done pictures on the actual birth, as well as co-sleeping, breastfeeding, etc. etc.....
It's a favorite!