A superficial dermal sinus will not cause much problem to the child. Your baby has to be examined to see if she has any neurological deficits. If it's not there and MRI also does not show any spinal connection, then you need not worry. The only problem it can cause is local infection. Make sure you keep the area clean. Wash with soap and water everyday and dry with towel

It may be pilonidal sinus..look for discharge if present need minor surgical procedure.if it's only dorsal sinus and superficial better to have minor procedures like glue injection so to obliterate the tract.. Once it gets infected and filled with fluid..she will have symptoms

Wait m watch

Dermal sinus tracts, even if superficial, can have deeper intraspinal connections, sometimes associated with tethered cord or dermoid cysts. MRI is the gold standard, but in infants, detection may be limited due to incomplete myelination and small tract size. A high-resolution MRI with contrast, ideally in a tertiary pediatric neurosurgery center, is advisable. If clinical suspicion remains high, repeat imaging or ultrasound (if <6 months) may be helpful.

MRI is usually the investigation of choice but has limitations especially for small tracts or in infants where incomplete myelination is present.