Hungry still?

So my little man started big, 9 lbs 13 ozs. He’s 4.5 months and is 12 lbs 15 ozs. I was pumping and nursing bc of work now I’m on summer break and am mostly nursing. I’m worried he’s hungry still. He sees a bottle and wants it no matter how long it’s been since he’s nursed. Is he hungry still? I swear he could eat forever. He’s had a spitting up issue and we are dairy free now. I read it’s normal for some babies to take a bottle after nursing just bc it comes out easier...or something like that. He also is chewing on his hands a lot but I think it’s just his age??? Idk I’m constantly worried I’m starving my poor baby but the pedi isn’t concerned bc he’s gaining weight and is following his own growth curve. I want to continue nursing but it’s so stressful.

Any advice is appreciated.