My son is 4 months has umbilical hernia.past two days he's been really unsettled.in pain.slight temp. not drinking. no poos.does he need to go to a &e?

Give the doc a call: Not sure what "a ; e" is in the question, but based on your concerns, would give his doctor a call. Babies can be fussy from gas, hunger, fatigue, teething, illness, and so on. Since babies can't talk, parents and pediatricians rely on other clues to tell us when they may need something. His symptoms may be all one and the same or seperate issues. Call the doc and share your concerns.