I can't possibly understand exactly what you are going through as this is my first baby. But I do understand doubt. My so seems like a bigger child than the baby will be, we seem to fight everyday, and my two senior dogs bark if you stand up to fast. Everyday I wonder if I made the right choice in having a baby now, but there is one thing I am 100% sure of, and that is that I will love my son with every atom of my heart. And I know that same is true for you. Your daughter may not understand right away, and things won't always be easy when mommy needs to give the baby attention. But it will be the small things that tell her everyday how you feel. Keeping some of the routines the same, bed time tuck ins and story time. You are stronger than you know, and you can work through the tough spots with all the love and patience you have ❤️ good luck momma