How do I take care of the baby?
It sounds like your cousin is incredibly rude and ungreatful! If she is treating you like that when you are hosting her at your home, making you watch HER baby, and then expecting you to just magically know what to do without any experience, she certainly should NOT be getting on your case about how you care for him. If she doesn’t like how you care for him SHE should teach you and be greatful that you want to help her out, not be mean to you like you described! I’d kick her butt out of my house – actually, I’m too nice to do that – but I would tell her to either show me how to properly care for the child or tell her to take care of him herself. She is on vacation but her baby is still HER baby and HER responsibility.