Thanks for writing to us.
in the anterior fontanelle
in a 13 month old without any apparent signs of trauma/alteration in behaviour/change in level of consciousness/vomitting/loose stools/will not be a serious issue.
kindly check his both pupils with a torch whether both are equal and reacting normally to light ie.,the pupillary apertures are both of same size and closing with same pace on throwing light at them.
If there are no problems in pupils also be assured that there is nothing wrong at all intracranially.
There is no intervention required as it will resolve with time.Please be reassured.
If there are any neuro symptoms including pupillary assymmetry etc ,pls consult your MD immediately.
Dr Lt Cdr ASN Bhushan.