 [ Symptoms ] i am 15 and have knee pain people say that its growth but can it be something else seeing as i do a lot of sport  when my knees hurt it is usually during and after strenuous exercise or when walking down steep hills [ Disease ] any powder can cause respiratory difficulties in children this is why many pediatricians no longer recommend them the recommended diaper treatments are ointments and lotions not powders if you do use it be very careful not to cause a cloud of powder that you or your baby will inhale