Is this weird?

My son is a year old, He just turned one this month. He has had this really weird obsession with.... Belly buttons... 😂 Yes you heard it right... He will go up to anybody and try to pull their shirts up to see their belly button.. The people he does it too just see it as a child coming up to them and trying to life up their shirt, Which can come off as extremely weird... Idk where this started with him, but its been a thing for a few weeks. Today my friend came over and she was sitting on the couch he walked up to her and she was setting back and he tried lifting up her hoodie .. 🤦🤦 I do tell him "no" and I am working on breaking the habit. I have 2 other older children and I have never gone through this type of thing with them. I know it's innocence but it just feels and looks wrong when he randomly trys pulling up his cousin or some random persons shirt. When he does actually get their shirt pulled up he pokes their belly bottom and will stare at it for a second. 🤷🤷🤦 The he will laugh. Making this exact face👇👇👇

Until he moves on to his next victims belly button...