21months old have problem with swallowing rice

Hi mommies, My 21 months old boy currently have difficulty to swallow rice or other solid, He mostly eat porridge and drink milk. He likes to eat bread but need to give him in small bites. If bigger bites he will show sign of vomiting. I read that every child development is different, but I see all of his friends can eat and swallow meals well, even toddlers who are smaller than him. Should I consult PD or nutrition doctor? or this is not something to be worried about? He is still using pacifier, is this something that affected his swallowing of foods? I see his teeth development is also slow :( Very worried, hope mommies can advice me, Thank you