Hi

looking to book our our first ever flights with Singapore from the U.K. to Australia, with a stop in Singapore for a couple of days. Is it possible to book extra leg room in economy? If so roughly what cost if anyone knows? Also our daughter is 3 so I’m guessing the extra legroom would have to be in non exit areas?

there are 4 legs in total. Is it possible to book premium or business on some legs and economy on others? Tried a dummy booking on their website and it doesn’t allow me but thought I’d ask. Many thanks.