Hi there,my 4 year old daughter hs a odd smell coming from her mouth(I'm guessing a metallic smell,it kinda smells like a hospital).She has complained of a tummy ache,she has a cough.My son had the same smell from his mouth about 2 weeks ago and his tummy hurt as well,but then he had a good bowlk movement and it was gone.He was left over with craked sores on the corner of his mouth that I tought was angular cheilitis.They are going away now.My daughter is still actice,eating well,drinking well etc.What is this I am very concerned?