Books to introduce a baby

I’m pregnant with twins and have an 18 month old. Looking for ways to introduce babies into our daily lives without being pushy. She loves reading, we read back to back books In the morning and again after tea every day so looking for recommendations for books that I can add to her collection that have babies in them.  The ones I’ve seen are very aimed at bring babies home from hospital or being a big sister. I’m looking for normal stories that have babies in them just so I can gently point out the baby in a positive way. Any recommendations? Thanks