This haircut looks good on boys or girls. If they have a natural curl in their hair, don't try to fight it and let them show their little angelic side at least in their looks with a head full of heavenly golden curls.
Layers help a lot to gain a little bit control over the wilderness and are the best way to shape the hair so that it falls nicely all the time. Use some wax or gel to accentuate certain areas and do not over-style it.
Brushes should rarely touch hair like this, instead use a wide toothed comb to keep the curls intact and to avoid frizzy hair.