Have to pay EXORBITANT amount for infant sitting on my lap. Rather book with LIFT.

Found out AFTER I bought a very expensive ticket for myself that I ALSO had to buy a ticket for my 6-month old infant (who will sit on my lap since he can't sit, crawl or walk) at 15% of the cost of the ticket. This is daylight ****** ******* for a child siting on my lap and I will never, ever, ever support this airline ever again, I will book with LIFT. Apparently you can check in a 20kg bag for the child as well, but I would have purchased an additional bag check in online if that was what I needed. It is an absolute disgrace and I am so upset that I didn't use LIFT. Rather book with lift, and send Flysafair into the abyss like all the other airways.