Just to let anyone who stubbles across this thread my son was born with a tethered spinal cord it was without warning as it didn't show up on scans, it has however not caused him any problems to date apart from him holding back alittle urine when he pees . He needs to have an operation called a detethering , as it's likely to cause him serious issues in the future such as bowel , bladder and lower limb movement issues which would all be unrepairable. So at 8 months of age he's off to GOSH next week and is likely to remain there for at least 4 to 5 days . Fingers crossed his spinal surgery will go well and I'll update after his op. xx