K.P.
Please stop washing his hair daily. Washing hair strips the hair of its natural oils which is especially bad for this hair type. Washing his hair once a week is better. Get a hard or medium bristle brush. Wet the brush and softly brush through the hair. For really tough lint you may consider using your fingers to remove it from the hair. You can use some natural oils such as jojoba, almond or even raw shea butter on the hair for sheen.
This hair type shouldn't really be combed but brushed or finger combed. It causes less stress to the hair. If you really feel the need to comb through the hair, start at the tips and work your way back to the scalp. Work with small sections of hair at a time instead of it as a whole.
You can even use a damp wash cloth to remove the lint. Just slide it over the hair where there is lint. The lint will be picked up.
His type of hair has the ability to hold water so be careful not to let him leave the house with a wet scalp because this can expose him to germs and he will get sick.
You can also switch to satin pillow cases which do not hold lint. You may also consider getting him a wave cap or bandana which he can wear on his head at night to protect his hair from lint. Hopefully this is helpful to you. Let me know.