A.C.
Prop one end of his mattress up using extra blankets and stuff. Lying flat is terrible for congestion. Also, Walmart sells a Pediacare plug-in that is approved for infants 6-months and up. We've used it in the past and it really helps (and my ped. says it's safer than Vicks). Keep running that humidifier, too. If it is possible he has allergies, keep the windows shut, and make sure the filter on your air conditioner is clear. Good luck.