Should I be worried about a speech delay in my toddler because of this?

My 2 year old talks quite a bit. He speaks in 2-4 word sentences and has several single words. The question is about his speaking a bit nasally. My cousin mentioned it to me yseterday and I had thought nothing of it until she mentioned it. If a tot speaks through his nose a bit, does that mean a speech delay or problem? He knows his colors, numbers, and like I said quite a large vocab in general. Should I be worried?