Two "Childish" Acts..

A birthday cake was presented and a birthday song was sung.

There was a (appro. 4-year-old) little boy standing amidst us, thoroughly enjoying himself by looking at the the cake and listening to the song being sung. Just see how he clapped along and the broad grin he carried, we know full well that he was just so happy.
This little boy was asked to give a peck on the cheek to the birthday boy. He gamely followed. His reactions immediately after the peck amused all of us who were present. He must have done it so sincerely and with all his might, so much so that he actually 'tasted' the face of the birthday boy. Ha.. to make it clearer, after the peck, we saw him licking his own lips and at the same time showing us some weird expression on his face. The sight is just so cute man....
Actually, many of us (the birthday boy included) went for a brief run and we didn't have time to wash up ourselves before the gathering. Haha.. that face must have tasted real salty :P

There was another (appro. 4-year-old) little girl looking on from a distance, while the birthday song was being sung. Obviously she was just as interested and she drew herself closer to the cake gradually.
While we were trying to get the cake divided to be shared, she "sneaked" in even closer, swapped her index finger swiftly and lightly across the side of the cake to dig up a little portion of the cake and immediately put that little index finger in her mouth. Wow.. what a moment to witness.
Socially, she might be appeared to be rude. But just look at her eyes, her innocent / pure look was enough for us to "forgive" her act. We actually laughed and rewarded gave her an even bigger piece of the cake (since she liked it so much).

In both instances, we laughed and find the little boy and little girl so adorable.
What happened if both acts were done by you and/or me?
What qualities these little kids have possessed so that they can be easily "forgiven"?
What makes their smile so attractive?
I always think, at times, we can also learn a lesson or two just by observing little kids.