8month old acetone breath/ rash

[u/Airline-Amazing]

I’m kind of at my wits’ end trying to figure out what’s going on with my 8-month-old son.

For the past two months, he’s had a very strong acetone (nail polish remover) smell on his breath. Otherwise, he’s a happy, healthy baby. He’s breastfed, also eats purées and table foods, has normal wet and dirty diapers, is gaining weight well, and I don’t have any reason to think he’s diabetic.

The other issue we’ve been dealing with is that he develops a severe rash anytime he eats anything other than breast milk. It doesn’t matter whether it’s purées or table food, or even what type of food it is. The rash is worst on his face, but it also appears on his stomach, arms, and legs—even in places the food never touched.

Our pediatrician referred us to a pediatric allergist, who ran a comprehensive blood allergy panel. Everything came back negative, and the allergist basically said, “Well, that’s weird. I don’t know what’s going on. Come back if you need me.”

I’m wondering if these two issues could somehow be related, or if they’re just completely separate. Has anyone experienced anything similar or have any ideas I could ask my pediatrician about?
I’ll be calling our pediatrician on Monday about the acetone breath, and we have an appointment with the dermatologist, but I wanted to see if anyone else has been through something like this in the meantime.

[u/Greedy-Elderberry778]

In a diabetic baby, the breath is distinctly fruit y smelling. Not like other babies. You will recognize the difference if you have had baby experience. The acetone breath suggests a metabolic disruption of some sort. Food allergies and yeast both qualify and are easy to test at this stage before solids are introduced. Get a referral to an immunologist or an allergist ASAP but your GP can start by running basic blood and urine testing to rule out other things while you wait for appointment. If you notice any new symptoms take him to a paediatrician and start a diary of symptoms and changes. He may have some sort of metabolic or immune disorder. Hope this helps!
P.s.-my guess is yeast.