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His underwear. On a daily basis.
Well only if you feel sweaty or smelly. If you have clean underwear on and you have only lay in bed through the night then you should not need to change again. If you have plenty of underwear then change it as often as you like but at least daily.
Discharge, if you see it crust that means you need to change your underwear more often.
would you worry if he never changen them? I also change mine daily.
His underwear. On a daily basis.
Not likely, unless they are in the locker room and need to change.
You should change your underwear every day because it promotes good hygiene and also if your underwear is dirty it can irritate your sensitive skin in your pubic area.
Change underwear size
A boy does not need to wear a girl's underwear if his crouch is getting big because the underwear is not designed for them.
Islam teaches Muslims to stay clean and tidy. In Ramadan Muslims pray and fast for forgiveness and obviously need to stay fresh and clean. There is no reason why the underwear is not changed during Ramadan. Clothes and underwear are regularly changed.
time to change your underwear
A change of their underwear