That Toddler Curiousity

There are two types of toddler portraits that hold a special place in my heart. The exuberant tot running towards the camera showing full motion. Or, shown here, the inquisitive little one caught in the act of curiosity.

I imagine parents of toddlers see this expression everyday, multiple times a day and I bet it can be an exhaustingly difficult time. Nonetheless, it is an undeniably adorable expression, yes?