We had the same problem & then found out Daddy was feeding her a bunch of food with high sugar. Sugar feeds yeast. Her pedi said NO MORE SUGARY FOODS. Many times it's what is inside coming out thru the stools & burning the poor bum. I have had a home daycare for 17 years. What I do is to find something on the internet about yeast & diaper rash & print it off & give it to the parents. They might not know whats causing it or have a clue how to fix it. That way they see it in black & white & I explain how painful it is & that you were worried about the baby so you researched it. They should appreciate that you care so much to do that. If I can find my info I'll send it to you.
Here it is:
PAT GIMA’S YEAST TREATMENT PLAN
It is important to remember that the yeast overgrowth is throughout your whole system, and you want to restore a healthy balance between the yeast and the healthful bacteria. Just killing off yeast doesn't resolve the problem. It will always return unless the proper balance is restored, and this takes diligence and working with your and your baby's physicians. The best prevention of candida (yeast) overgrowth is a good diet, a healthy immune system and a healthy intestinal tract.
We always have yeast and bacteria in our gastro-intestinal and vaginal tracts. In a healthy state they are in balance, and both are essential for health. However with a yeast overgrowth, the yeast overpopulates our systems and we have what we call a "yeast infection." In your baby, a white tongue can be an early sign of oral yeast (thrush). If not treated, it will progress to patches of white on tongue and cheeks. It causes a sore throat and tongue and, sometimes red, sore skin in the diaper area, along with irritability and excessive gas. A baby with a sore mouth from yeast will often not feed well.
Diet
Reduce sugar to a minimum and use no artificial sweeteners. You can eat some fruits and natural fruit juices, but they will best be consumed with other non-sweet foods. Avoid sugar-added fruit juices. Herbal teas and water are a good choice of drink.
Any refined carbohydrates that you eat (breads etc.) will be best eaten with other foods--vegetables and meats--so that they will not feed the yeast.
Eliminate dairy products until two weeks after all symptoms are gone. (Dairy products do not include eggs or mayonnaise, but products that come from cows milk.) You can eat plain yogurt (no sweetened or fruit-added ones) with live acidophilus bacteria if you are certain that there is not a dairy sensitivity in your baby or yourself.
Three times a day, open a capsule of acidophilus/bifidus, sprinkle 1/3 of the contents on wet finger and let baby suck finger. This healthful bacteria will begin the re-balancing of your baby's GI tract. For simplicity, open 4-5 capsules of the acidophilus/bifidus and empty the capsules into an airtight container. Keep tightly covered in the refrigerator. Three times a day, wet your finger, touch the powder and let you baby suck your finger.
Diaper Area
Rinse with each diaper change with vinegar/water solution (1T. white, distilled vingear/1C. water.) Apply antifungal ointment. Do not use baby wipes, as they nurture the yeast. Use clear water for clean-up of BM, then rinse with the vinegar solution.
The following should be continued for 2 weeks after all symptoms are gone:
• Vinegar rinse for nipples;
• Antifungal cream
• Acidophilus for mom and baby;
• Garlic and/or Echinacea
• Vinegar rinse for diaper area
• Nystatin or Lotrimin ointment for diaper area, or if you run out, Desitin or Balm-X (zinc oxide) will do.
• Avoid the use of anti-bacterial soaps, which destroy healthful bacteria. Also if your water is chlorinated, fill a pitcher with water and let it sit for 12 hours lightly covered and the chlorine will be dissipated. The chlorine may reduce some of the bacteria that your are trying to restore.
This treatment plan seems very complex, but after a few days it will seem simpler, especially when you are feeling better because of all of your efforts
Sunlight is a good treatment for yeast overgrowth. Sunlight on nipples and baby's diaper area is helpful, but even a walk in the sun or sitting in a sunny window helps also.
Also Fun. Try to remember what brings you joy, and do it. Laughter or relaxation or things that make you smile will boost your immune system and help your body to return to a state of health.
REMEMBER: Continue the recommended complimentary treatments for 2 weeks after all symptoms are gone. There is a temptation to grow lax after you and your baby are feeling better, but the yeast overgrowth can come back until your system is restored to its proper balance.
Good luck.