You can get a proper humidifier for Ā£25 on Amazon. Got one the other day as weāve both got chesty coughs, stuffed sinus and ear ache. Itās helped significantly! Also Vicks for toddlers on back chest and feet before bed. Vitamin c supplements. Get them out in the fresh air (dressed appropriately) as this does then well and helps clear mucus. If you can stomach it then you can buy saline spray for their nose which really helps but I canāt bring myself to do it to him! C
Have you got a diffuser? I often use one in my little boys room when heās poorly and that helps. Just add some drops of frankincense oil as that can help to clear a cough. Xx