Im back i remember a year ago my officemates daugther had the same problem... texted her and she said she had her daughters birth certificate amended from Baby girl to the one she is using... She just went to the City Hall of where the birth took place. ask for the form for ammendment of name bring also the NSO copy with you under the name of "baby girl" fill up the form and file it in the city hall. Soon the ammended brith certificate will be ready in NSO...
Hope this will help u....