Thank you for your query.
This is the persistance of metopic suture.
It is mild overiding of the bony suture.It is not much of a concern.If you not 1005 confident you can go for a CT scan
to confirm that there is no malformations.
I would ask you to wait till 18months.
Consult your doctor if the problem persists.
If you have any further queries you are free to consult me.
Hope this answers your query.
Wishing a speedy recovery.
Have a nice day.