What possibly caused the death of the baby?

The baby brought to hospital was having a fever, diarrhea and cough, he was also experiencing convulsions. The doctor said that the baby was dehydrated so the baby undergone IV therapy. The baby consume 2000 ml of IV fluid within 4 hours duration approximately but unfortunately the baby died in less than 24 hours. But what made me think was the appearance of the baby now, he is edematous almost the entire body and having bruises or dark spots like a blood clots in his body. Is it suggestive that the caused of the death was fluid overload? Or what could be the other possible reasons for his death and why is it that he was having an edema?

Sounds like fluid overload to me as I can't imagine a baby being given that much IV solution in that short of a time. I could be dead wrong though.

I know this sounds ridiculous but find a lawyer who specializes in medical malpractice and tell them about what happened. Ask him to find out what happened and why the baby suffered from fluid overload.
The bruises and dark spots can be from many things - IV needles, turning him, his convulsions. There are numerous reasons this would happen.
This is a terrible thing to have happen and you need to know why. A good lawyer will be able to get the answers for you.

seems way to extreme and overload for such a short duration of time to me give the circumstances

Could have been dehydrated from the diahrea from what source who knows then sepsis may have set in . If they do an autopsy the findings will be there. Unfortunately when kids are sick they will remain on a plateau for a while and seem ok and then the bottom drops out, at that point it becomes life or death unlike adults who when sick have a definite sloping decline. Its a horrible thing and why it is most important to really pay attention with kids.
If you are the parent you need to set an appointment and talk to the doctor who may help explain things to you and if you are the healthcare personnel talk to some others around you for guidance and to vent..It helps..
As for the fluid- there are set parameters for them to follow as well as the childs condition and tolerance to large quantities of fluid, It is a fine line that you have to watch. Really sick kids are tricky.

The average fluid intake for an infant is somewhere between 100-200(max)cc/kg/day. Usually, fluid boluses are 10ml/kg with reevaluation of hematocrit/hemoglobin, aterial blood gas, and blood chemistries to make sure that fluid balance is appropriate.

When the organs (esp kidneys and heart) stop functioning as a result of sepsis or vascular collapse, the blood vessels can get 'leaky' resulting in edema that is not necessarily a result of too much fluid. I would ask for an autopsy, if you are the parent or guardian. If you are an employee (since your use of medical terms suggests), and you have concerns you should be able to talk to your supervisor or voice your concerns to the appropriate person.

2000mL of IV fluid in 4 hours equals 500mL per hour. If this is correct information then that child experienced fluid overload.

Just to give you an idea of how much...a woman during childbirth (think about all the loss of fluids experienced) gets about 125 mL of IV fluids per hour.

Signs of water intoxication are irritability, somnolence, headache, vomiting, diarrhea, generalized seizures* and the child may or may not be edematous.

It is possible that the child passed due to other circumstances but it is also possible that the child died from fluid overload. I would call a lawyer because a serious error was made by the medical staff.