Other moms out there I need advice!! My little one wants his bottle but as soon as he trys he just…

Other moms out there I need advice!! My little one wants his bottle but as soon as he trys he just screams and cries.. I finally tried pedialyte and he took that no problem and fell asleep.. what could be causing this?

He usually eats every 3-4 hours and it's been about 6 hrs now

We did not switch formula or the temp or water or bottle

Just trying to figure it if he is teething or is sick or what? Thank you for your advice in advance