Can accidental brain bleeding be diagnosed in one day old baby?

Yes. In the early years of CT scans they scanned hundreds of "normal" newborns only to find as many as 3% showed some evidence of a small hemorrhage. This was often attributed to labor & delivery related trauma. It is usually now located by ultrasound through the soft spot to avoid radiation exposure.
Yes. An ultrasound through the fontanel (soft spot) can often show an intracranial bleed.