May I ask what is the infant meal on singapore air?

https://www.singaporeair.com/en_UK/sg/flying-withus/dining/specialmeals/ Depending what you order when booking the tickets and how old is your baby. You may google for the image of the food as I can't attached it here.

Infant meals are usually a jar of puree for your infant. Whats your LO age? from there we can advise which meal to take?

my 13mo was given 3 jars of heinz puree n a teething rusk

Puree. What airlines are you taking?