I posted a chest rub a little while back for a congested baby. This next remedy is for diffusing.
3 drops Marjoram (helps break up mucus)
3 drops Lemon
3 drops Frankincense
Diffuse this in your baby's room while they're sleeping. Diffuse SN's Shield Blend in the main area while they're awake.
I'll be doing this tonight for Theo. He's just a little congested and I am hoping to keep it that way!