My baby is constantly hungry, what is happening?

Hello, I am a FTM to a 2 week old little boy. I am breastfeeding and just started pumping once a day for a bed time bottle. My son seems to be hungry literally all the time. I’ll feed him for 30 minutes, I can hear he’s eating. Then 20 minutes later he’s acting like he’s starving and cries til I feed him again. I have an oversupply of milk and can pump 4.5 oz in 10 minutes. We don’t have an issue with latching or anything else I can think of. Is it normal for him to want to feed every half an hour during the day? At night he will go 4 hours before waking for a feed. Is this just cluster feeding?