u/Equivalent-Monk-5328

I seriously need some advice. I exclusively breastfed my first baby so I never had to figure this stuff out. I exclusively pump my 2nd baby. I pump every 3 hrs and produce 4.5 oz. He is 3 months and he drinks it all. As he grows do I need to increase the oz? Would I have to start combo feeding since that is all I am producing? I really would like to make it a year breastfeeding him like I did for my first.