Humidifiers work well too, especially ones specifically designed for nurseries. I got one for DD it is a Vicks. Yes, saline spray is good, as well as lifting up the mattress. Also, a little Baby Vicks under the nose and on the chest and back works wonders for coughs!! Colds in children last 10-14 days. If they start draining green mucous, for more than 24 hours, take them back to the doc. This is usually a sign of an infection. Also, vomiting, diahrrea, fever, etc. warrants a visit. My DD usually ended up with an ear infection from all her colds as a baby, so we took her to the docs a lot, and had to improvise for them at home as well. Good luck, and I hope your DD's feel better!