A.T.
I think we often underestimate little one's emotional maturity & ability to understand what's going on. It's possible that she's upset. But it's also possible that you just don't feel right about it too (no offense intended, I know this must be really hard for you). Either way, she is connecting very strongly with the new nanny & it is up to you whether or not you're okay with this. If you're not, it's time to reorganize life situations so that you can be there with her more often. Whether that means quitting your job or just taking a day off a week, you're obviously picking up on something that is bothering her & it's important not to ignore that & say she'll just get used to it like many people do. This is the most important job I've ever had! You seem genuinely worried & I don't blame you, this would be heartbreaking for me to do at 4 months..baby's just need lots of mommy time. There's always a way! Good luck with everything.