Girls, share how you feed your babies? We're breastfeeding. Always fed…

Girls, share how you feed your babies? We're breastfeeding. Always fed on demand. But before I saw that demand immediately. As soon as the daughter started to be dissatisfied gave breast and ate well. Plus still fed at bedtime and after sleep sometimes. Now it doesn't work like that. Maybe she cries, but doesn't take the breast, not hungry. Or she doesn't care at all, although she hasn't eaten for two hours and doesn't want to. So what interval should there be in this age?