Baby won’t drink as much?

Has anyone else noticed their little ones drinking significantly less formula now? My baby started decreasing the amount she was drinking about a week before she turned 6 months, I thought introducing solids would help but she is now drinking even less since starting, and I’m starting to get worried. She isn’t sick and isn’t getting sick, I heard it was normal for them to decrease a little bit but she hasn’t had this little since she was 1.5 months old. Anyone else going through this or know if this is okay or not?