Getting worried, any of your kids "moans" or does "mmmmm" while eating?

My son (almost 4yo) does a lot of "mmmmmmm" sounds when eating foods he likes. He does this since he was almost a new born. People say it's cute but he's growing up and i'm sure kids will mock him in school.Did any of you have the same experience? Does this go away? Should i visit a doctor? via /r/Parenting http://ift.tt/2pmUjQg