I saw your question posted on sunday 24th just now ( june 30th ) Unfortunately it is 7 days, yet the situation can occur to many parents, hence this answer.
and pentaxim generally do not produce fever.
If at all a very low grade fever
with in the first 24 hours is the norm.
This should be viral infection and child needs evaluation from that angle.
As far as vomiting
is concerned if the vomitus is yellow in colour or is associated with nausea, then evaluation is required
, if there is blood in the stools child requires antibuiotics. Otherwise we can wait.
Regarding fever, develop the habit of measuring it. If it is more than 104 it is high, less than 102 is low in between is moderate.
After giving paracetamol
, fever should come down and activity should go up. If these two things happen then it is ordinary fever.