When do babies start the clingy stage? My son is 6 months and only wants to be held.... I'm all for…

When do babies start the clingy stage? My son is 6 months and only wants to be held.... I'm all for holding him all the time I'm just curious because he's so fussy when I put him down to do something so I'm wondering if I know he's at an age where it's ok to let him fuss a little or if he's still to young for that.