2nd time mommy question

I’m almost 16 weeks with my second and the past two days I’ve been so emotional about my little girl who is 2 becoming a big sister. I’m so worried she’s going to feel hurt and left out once the baby is here. I know I have so long until November, but my heart hurts thinking she may have a hard time transitioning to becoming a big sister.

She knows I’m pregnant and she talks about her baby sister all the time...giving her baths, helping feed her, changing her diaper, etc.

How can I prepare her for the change?