My son / daughter emits very bad foul smell in their armpits any remidy to get free from this smell?

Depends on the age..: Teenagers will often perspire more often and during the early stages of puberty will need to pay close attention to hygiene and grooming in certain areas to decrease the chances of body odor. Certain foods can also cause foul smelling perspiration. If this is happening in a young child, after attending to hygiene, i would strongly consider discussing the issue with your child's pediatrician.