She'll let you know. Don't worry.

@karina809, oh ok. My boys are a week old as well. She'll be fine. 😊

@dang_dridri, shes only a week old. just wanted to make sure. earlier i think i over fed her. she threw up a river...like 2 oz seriously all at once . ok great. i wanted to make sure. im not starving her by waiting 2-3 hours since they said breast milk goes threw them quicker

My pediatrician told me about every 2-3, no more than 4 hours. You want to at least wait 2 hours so they don't over eat & throw up. It may be different for older babies though.