Hi,
Please check out the links below, they may help you in finding a good neurologist for cerebral palsy.
http://yellowpages.sulekha.com/kolkata/health-services-medicine/clinics-doctors/neurology/39.htm
http://www.sabjanta.com/list-of-doctors-at-kolkata/neuro-surgeons-neurologists.html
Hope this helps!
check out www.indiancerebralpalsy.com for more information on dr vipul shah ,he is international expert on treating children with cerebral palsy