I'm ashamed to have only just noticed my second son, who is 23 months, has been growing very slowly for at least a year. I have HV measurements for height of 91st centile at birth and ~75th through the 6 month check. And being the second son that's as much data as was recorded. No 1 year info. On measuring him today to find him at 13%, I looked back to measurement from car seat fitting at 16 months to find he was 34% then. So he's been dropping. He had a bad bout of bronchiolitis and always seems to have a cold and a cough, though he's active and very clever, so developing fine in most obvious ways. Mortified I didn't notice this sooner and wondering what to do next and how much it's reasonable to worry? Thanks for any advice.