Hi, thanks for asking in Healthcare Magic.
The reason for your son's fatigue, grumpy mood and sleep could be fever.
Measles which usually occurs around 9 months. Infants are protected by maternal antibodies
which declines by 9th month. Hence the vaccination
MMR (mumps, measles and rubella) is given during this time. If you have not given the vaccination, then the rashes could have been due to measles. Early symptoms are fever, cough and white spots
in mouth. Rash appears on 4th day. But rash is always accompanied by high fever
and diarrhea in measles.
Mild rash without fever could be due to Rubella, enteroviral, adenoviral infections, insect bite, drugs or bacterial skin infection
. Treatment depends upon the cause of rash. Visit your treating Dr. for early diagnosis and treatment.
I hope this is useful to you.