Heyyy, if they don't, it adds to my awesome theory that Yoshi's Island was full of censorship, that Kamek actually blew up an airplane in cold blood with Mario's family aboard, the Super Mario brothers survived and when the Yoshis found this out at the end they had no choice but to raise them themselves. The stork was never real and neither were the stills at the end
Certainly explains their primarily jump-based fighting styles and how they could handle themselves well enough so early on