Going back to work guilt

I have been blessed to stay at home with my daughter during my pregnancy with her and now that she’s 13 months... with our situation now I am needing to go back to work soon! And i can’t help feeling all the guilt. She’ll be staying with her grandmother( my in law) while I work and I constantly feel sad thinking about leaving her behind as our bond is so strong. I guess what I need are some affirmations and positivity because I know moms do this all the time so I don’t know why I feel guilty for going back to work.