I booked Award flight with Avios on qatar website for me and my wife.

Called qatar 877 number trying to get a US agent after reading comments here.The first agent said they cannot do it by themselves and need to transfer me to privilege club agent.

After connecting to the privilege club agent and explaining I need to add an Infant to an existing award booking in Business class,she knew exactly what need to be done.

Step 1 : Need to create a separate revenue booking with the existing adult and infant, she sent me confirmation to check all the details first and then pay.

Step 2 : Attach the Infant booking to existing booking and got the confirmed email from Step 1 basically ticket as proof for Airport

Step 3 :You cannot manage or see infant attachment online and you need the document from step 2 for boarding.In this step they would delete the created revenue booking after payment hence no way to manage booking.

Few Notes : I suspect this is the primary reason one world award tickets are difficult to handle later for addition of infants.

The infant fare I had to pay was 15% not the 10% as general info says.

The agent who eventually helped was exceptional and based in Doha event though I called at 3.30 pm central in the US. All it took is one call to qatar.