my 5 day old puppy has inhaled a small amount of milk from his mums teat it has made him sneeze can anyone give advice on this

My only concern would be that he didn't inhale the milk but perhaps has a small cleft palate, and milk is coming down his nose that way?

The other thing is some puppies are so greedy the milk seems to come out everywhere. You will know shortly what one  it is.

They all seem to be doing it they seem that greedy when its time to feed that its going up there noses , its quite worrying , is this normal?

I would get them checked by the vet myself to ensure that there's nothing there to cause a problem.  They could be just greedy pups but for all of them to be doing it is a bit worrying.  Hope it's nothing. 

I would just get them a quick check over the vet can look in the mouths with a little torch but I have hd nearly whole litters doing it. I got the freight of my life when I first saw it.

I would still always say if it worries you get them checked.