Hi, I would like some advice please!!

Alfie (14wks old) has been throwing up.. it started about a week ago with him making horrible heaving/coughin noises but nothing coming up. So got him wormed again on Monday.

Sinced then he hasn't been throwing up. But this morning he threw up but there was a bit of cat food in it this time... when he throws up it's always about 4am!

He's really lively and not looking as if he's under the weather.. his temperature was normal on Monday aswell...

Is this normal?