I noticed it when I was pregnant, sometimes I could hear her click if she wiggles inside me , the midwife thought I was nuts until she heard it herself.
Since she’s been born I’ve noticed she is still clicky.
When she lifts her arm up sometimes you can hear it, or her leg kick now and again.
She’s had all her checks and is fine, she’s even stayed in hospital for a few weeks for something unrelated and no one said anything I just wondered if anyone else had heard of this in their children