When creating a reservation with an Infant occupying a seat, the INFANT SSR/Keyword must be entered in the system and related to the infant. 

Once entered, the system will judge the cabin class and equipment and will send a message based on eligibility. 

"UC" for the non-eligible equipment and "HK" for the eligible equipment.
Infants occupying a seat must be seated next to an adult who can set O2 (oxygen) masks for the infant. See further details in the graph below.

Cabin Class Aircraft Type Seat Configuration Is infant occupying a seat permitted? GDS Response to INF keyword 

First Class
 
All aircrafts - Not permitted UC SOC INFT UNA USE IN THIS CABIN
Business Class B787-10 C38/PY21/Y235
(294)
Not permitted
B787-9 C40/PY14/Y192
(246)
C40/PY14/Y186
(240)
Not permitted
C48/PY21/Y146
(215)
Not permitted
B787-8 C46/PY21/Y102
(169)
Not permitted
C32/PY14/Y138
(184)
Not permitted
B777-300ER F8/C64/PY24/Y116
(212) NEW
Not permitted
F8/C68/PY24/Y112
(212)
Pair seats
 D-F and E-G next to each other permitted
HK PLZ ASR D/F OR E/G FOR SOC INFT AND ADULT
F8/C52/PY24/Y166
(250)
F8/C52/PY24/Y180
(264)
A380-800 F8/C56/PY73/Y383
(520)
Pair seats E-F next to each other permitted