Hi,I have an 8yr old who has had the same problem with body odor since she was 3yrs and she started going thru puberty at 6yrs and her Dr. had concerns and did a CT scan of her brain looking to see the pituituary(unsure of spelling) gland, which controls growth and other chemicals in the body, the scan came back normal so now we have had an appt to see a childrens endrocrinoligists(not sure I spelled that right)I've had the appt for 9 mnths he's the only one here in Tucson his name is Dr.Wheeler, she could have a yeast problem internal which could be treated much easier, although most Dr.s tend to know nothing about yeast and will diagnose for some other issue like allergies and prescribe antibiotics, and that only makes yeast more troublesome, my neice had candida which is a yeast inside her body causing constant tummy aches burning when peeing and there was no obvious signs just bad odors, her mom was put on tetracycline when pregnant,before she found out she was pregnant and was on it the full 10 days of prescription, so we kinda think that maybe the cause of her daughters yeast problems because tetracycline is so strong it wipes out all your own bodys enzymes that keep you healthy, avoid it at all cost, the Pediatrican told my sis to go get Candida enzymes at the health food store so we looked it up on the internet and found it much cheaper...I would do some research on what may be the causes of child body odors, the internet is a great resource...keep us updated..hope it is something simple...may need a new pediatrician, we use to see Dr.Scalowsky on Ina,rd don't know if he's still there though.
take care;)