Options for redeeming Infant award redemption?

So looking at options for redeeming 2 adult seats and 1 infant in J/F class - currently have surplus Amex points.
What I know; Apparently Qantas only charge taxes on infants, Singapore Airlines charge 10% of cash fare (no points option). Anyone able to confirm or expand on these and other Amex related programs would be great.

This Point Hacks article would be helpful IMO.

All you need to know about using points to travel with infants

Qantas and Velocity program do not charge anything for infant redemptions.