The classic cute cartoon body type works for both male and female characters because it illustrates a character that is not physically mature. The cartoonist needs to use details to suggest which character is female and which is male: color of Clothing, hairstyle, eyelashes, and optionally, lips for females. With lip colour and jewelry (such as earrings) do be careful not to use colors and styles which should be reserved for older characters.
Sometimes drawing a character that is obviously a boy or girl means using 'stereotypes'. If you want to avoid these, you'll either need to be creative in your thinking, or accept that rejection of stereotypes also means having less visual cues to gender identity, and that this doesn't matter for your character.