Tense or bulging soft spot
High temperature (warning - could be normal or low in babies under three months)
Very sleepy / staring expression / too sleepy to wake up
Breathing fast / difficulty breathing
'Pin prick' rash / marks or purple bruises anywhere on the body
Diarrhoea (though only sometimes)
Vomiting / refusing to feed
Irritable when picking up, with a high pitched or moaning cry
Blotchy skin, getting paler or turning blue
A stiff body with jerky movements or else floppy and lifeless
Pain / irritability from muscle aches or severe limb / joint pain