He leaves me speechless.

 Pawpaw brought him an airplane on Father's Day.
Hayes hadn't been feeling well, and this day was a stretch for him.
Poor kid has had one heck of a summer with sicknesses.
Plural. 
As in the whole month of June, sick.
Summer sicknesses are misery for all involved.

 But you would NEVER know that this kid is miserable.
He has a face that radiates joy.
His giggles could melt anyone's heart.

 He's just so tickled that he can't stop laughing!

 Look, he pretends to be shy.
Hilarious.

 I love his chubby hands.
I love his dimples too.
I am so sad he's growing up.

 Simply put, he's TOO big for his britches.