ok mamas my son's soft spot on occasion will sink in and out like it's pulsing what does that mean?? it freaks me out



I heard if it sinks in they're dehydrated but honestly I'm not sure I've just heard that
when it's sunken in like that it means their dehydrated so I've heard.
I have wondered the same thing..my daughters soft spot does the same
it will move with his heartbeat. it pulses my son's does that it won't after their skull grows together