MoHFW have announced new travel rules for international arrivals in India effective 14 February 2022. Earlier demarcation of at-risk countries and mandatory testing and quarantine for arrivals from at-risk countries have been done away with. 

Additional relaxation has been offered by way of allowing travelers to upload proof of full primary vaccination instead of the mandatory RT-PCR test that was to be carried out less than 72 hours prior to journey. This means that fully vaccinated travelers are not required to under pre-arrival tests. 

RT-PCR test or vaccination certificate has to be uploaded on the Air Suvidha portal. https://www.newdelhiairport.in/airsuvidha/apho-registration

Upon arrival in India, a random 2% of travelers shall undergo covid test at the airport. The travelers are to be identified by the airlines. All travelers have to self-monitor their health for 14 days upon arrival (doing away with quarantine requirements).  

Children under 5 years of age remain exempted from both pre and post-arrival testing requirements. However, if they are symptomatic arrival they may need to undergo testing. 

Full guidelines can be found here https://www.mohfw.gov.in/pdf/GuidelinesforInternationalarrivalsupdatedon10thFebruary2022.pdf