Thanks Racs for telling me that, it helps. I asked the Paed doctor why and she said she didn't know, then went away. When she came back she said the Dietician has told the nurses to do it based on his weight and age!
Rang the hospital and he is settled, the doctor said the Paediatrician would see him on rounds tonight but when I asked about it , the nurse looking after him said he didn't need to see him.