Hello Madam, thank you for your question!
It is difficult to determine the exact cause of this rash. If your child's general condition remains good, I suggest applying a fragrance-free moisturizer like Aveeno (which is oat-based) to the face and body as often as needed during the day. I also suggest using a fragrance-free soap such as Dove, and to avoid rubbing the skin too vigorously to dry it, instead, lightly tap it to leave a thin layer of moisture and apply moisturizer quickly afterwards.
In the case of very uncomfortable itching, we can suggest an anti-histamine such as Reactine (taken once a day, causes little drowsiness but may act a little less quickly) or Benadryl (acts a little more quickly but must be taken 3 to 4 times a day, may greatly sedate or cause excitement in the very young). Your pharmacist will be able to help you choose which one you prefer.
Finally, some childhood ailments can pose a risk to the pregnant woman and the fetus. Basic hygiene measures, such as washing hands and surfaces frequently and avoiding hugs, are usually sufficient.
I hope I have been helpful, I remain available if you have further questions
Tom Samaha, pharmacist