She's 1 now so everyday since she gets dirty now, but when she was little once a week i didn't want her skin drying out and our pedi said little babies don't need as many baths because they can't get as dirty. Obviously if she spilt something or got funky she'd get an extra bath.
usually every night but honestly the last 2 weeks it's been every 1-3 days. If I bather her every night I only use soap every other day. usually we just play and relax before bed time and to keep a routine