Create a character design of a friendly, chubby baby sitting down and waving. - Change the hair to a tuft of spiky hair. - Add a colorful onesie with polka dots instead of a diaper. - Modify the facial expression to include larger, sparkling eyes and a big, open-mouth smile. - Alter the feet to be slightly smaller and rounder. - Introduce a cartoonish sun in the background with a smiling face. Make sure to maintain a cheerful and playful overall aesthetic.