The introduction of new solid foods, which can change the composition of the stool or stool frequency, can also cause diaper rash. (babycenter.com)
You should introduce the food gradually and should wait around three to five days between introducing new solid food. (newkidscenter.com)
Keep your child on the foods he is used to; if your baby is an infant, avoid starting new solid foods while you're away from home. (breastfeedingtoday-llli.org)