My baby has platelet count 643 she is 5-month-old baby. I her platelet count is normal?
The factual answer is Normal platelets levels are 150,000 - 400,000. However see your doctor for interpretation and don't worry until you see a doctor irrespective of what the report shows
When blood tests are requested, ALWAYS take them back to the doctors who requested them for the interpretation. You are not supposed to be doing so! Lab results are usually interpreted in the clinical context.