My baby of 1 week old forehead, the fontanelle is not breathing like the way baby's head use to move up and down, please what’s the cause?

My baby of 1 week old forehead, the fontanelle is not breathing like the way baby's head use to move up and down, please what’s the cause?

If swollen, or deepened or not pulsating, see a paediatrician immediately.

Try to place your finger tip on it. Check if it swollen, deepened and pulsating.