Get some medised. It has something in it to ease blocked noses and helps them feel better too as it has paracetamol in it. I think they can use it from 12 weeks. Also agree with the steamy room thing. When my lo was like this when she was little I was told by the health visitor to put a drop of warm water up each nostril. Didnt fancy it myself but she swore it worked. I wouldnt take him into the steam while you are trying to feed though as it gets really hot, sit in there till he begins to sneeze then take him out and feed him. Also open windows and leave bowls of water on radiators.