Since my daughter was an infant, whenever she got a cold and had trouble breathing, this is the breathing sack I made for her. I have since made this sack for many babies with colds.
3 drops Peppermint oil
1 drop Lavender oil
Squeeze drops on cotton ball. Place cotton ball in sack. Safety pin at neckline of sleepwear.
(You can also toss these drops against the shower wall before bathing. Allow the aromas to infuse with the steam.)
I continue this routine, even today. My daughter does not care for the smell, so I pin it when she falls asleep.