Is this rash recent? It is probably alergic. It could be related to the new milk he is on, or it could be an alergy from other environmental cause. Considering the age, you should see a doctor as soon as possible. There are other causes of skin rashes in this age, and not many medications approved for small children.

HI, thanks for using healthcare magic

There are different causes for widespread rash, the most common is allergy. Other causes would be some types of infection but in that case there would be a fever.
The most common cause of an allergic rash at her age is food allergy and I am assuming at 3 months she is presently only on milk with no additional foods or cereals added.

It is unusually for a child to have an allergic reaction to nutriguiem milk because this is the milk used for children with allergies to dairy or soy proteins.

In children eczema can present in a wide spread fashion. This is a inflammation of the skin and is usually driven by some allergic stimulus as well.

If the rash is itching her, your doctor may suggest an antihistamine.
In addition , if he or she believes it is an allergy or eczema, she may be given a mild topical steroid cream to apply. It would also be important to keep her skin moist, within 3 minutes of bathing a moisturising agent should be applied. It should be applied repeatedly during the day.

the source of the inflammatory response needs to be determined so it can be eliminated.

I hope this helps

Hello

you have not mention that since how long time your baby is suffering from itching.
if the rash is appearing after taking nutriguiem milk most probably it may be due to food allergy you should stop nutriguiem milk and change your supplement milk.
and i will advise you to consult to a dermatologist for the treatment
ok
take care of your baby