Take one boy with too much hair.
Confine him in a highchair with a decent amount of hundreds and thousands.
While he's occupied picking them up one by one, cut away.
(and another photo of his finished block masterpiece - he can make the most impossibly balanced towers - like the buildings in Dr Seuss books)
My children have so much hair! This never ceases to amaze me because I've always had such fine hair that takes aaaages to grow.