Ginnu, see below and also the link. This is ambiguous.
"(ii) Foreigners visiting India on any other category of long-term visa which is valid for more than 180 days, are required to register only if they intend to stay in India for more than 180 days continuously during a particular visit. This registration can be done anytime within 180 days of arrival in India. "
http://residential.appolice.gov.in/faq.aspx#_6.5_Queries on Children
-----the above the link from Andhra pradesh Police
you can contact
Bureau of Immigration, Government of India.
Contact No: 011-26711384
Read the Andhra pradesh Police Link:
http://residential.appolice.gov.in/registrationofforeigners.aspx
1.0 REGISTRATION OF FOREIGNERS :
Government of India has entrusted all the State (Provincial) Governments with the functions of regulating entry, presence and departure of foreigners.
Foreigners should submit their online filling application along with the required documents to the FRO, Cyberabad. For the foreigners holding visas valid upto 180 days registration and leave India permission are not required. Foreigners having visas for more than 180 days should get themselves registered within 14 days of arrival in the limits of Cyberabad Police Commissionerate. However, Pakistani nationals should report their arrival within 24 hrs. and all Afghan nationals are required to register themselves within 7 days of arrival in Cyberabad irrespective of their visa validity. Delay in registration will make them liable for a penalty of US 30 $ each at State Bank of Hyderabad, Gruhakalpa Branch, Nampally, Hyderabad.
Extension of visa beyond 180 days will require registration.
Children below 16 years of age are exempted from registration. However, they are required to obtain residential permit and extension of stay. Foreigners having special endorsements in their visas do not require registration and departure clearance for visits upto six months/ 180 days, but registration and leave India permission are required if their stay exceeds six months/ 180 days.
Foreigners have to pay a penalty equivalent amount in Indian rupees of US $ 30 (commission is excluded) for overstaying and not registering with the FRO within the stipulated period.
Residential Permit is issued at the time of registration, its validity being the period of stay specified in the visa. Residential permit is not compulsory for minors. However, when the minor requires extension of visa, he/ she has to obtain a residential permit. Applications for extension of the Residential Permit should be made to the Commissioner of Police Cyberabad / FRRO at least TWO months before its expiry.