Help! Concern About Fluid on Baby’s Head

I will contact the GP on Monday but I was wondering if someone else had an experience with this. First time mum here 😭 I have noticed some fluid at the crown of my 2 months old head. The fluid appears to move around when I gently press on his head and seems to be located between the scalp and the skull. My baby was delivered vaginally with vacuum assistance. He initially had a lump on his head after birth, which disappeared after a couple of weeks. I am unsure if this current fluid could be related to that and whether it will resolve on its own. He is feeding well, sleeping, and remains active. The fluid does not seem to bother him.