How much should my 1 year old be eating

She’s gonna be 1 in a few days. I offer her 3 meals a day and snacks. But she always will eat tons and tons of puffs. But if it’s mealtime (even if she hasn’t eaten puffs or anything recently ) she will barely pick at dinners or any meals. Like take a few bites then wants down . Is this normal . She is also still breastfeeding , maybe I’m breastfeeding too much ?