In the first 6 weeks it is especially important to feed on demand as this is when your supply is established!
Babies tummies are tiny, at 2 weeks they're nt even the size of a ping pong ball yet! So a tiny amount of milk is needed, but because reastmilk is perfect, it's digested easily and quickly, babies feeding 10-12 times a day at this point is perfectly normal
There has been studies that have shown that imposing a feedin routine on breastfedbabies can cause failure to thrive, so it's very important to feed on demand. They will regulate themselves later on, but don't expect too much too soon. At 13weeks we're just getting g into a nice routine with it, though if we're at home all afternoon e will feed more regularly than if we're oyut, just cos h can!