Can I put warm mustard oil in my newborn's blocked nose?

Hello, Do not put anything "in" the nose. The best you can do is massage his chest and back and throat with a little ghee at the tip of your finger. And the massage means just apply and leave. Newborn's skin is extremely sensitive and hard massage or rubbing can cause rashes and complicate the situation. You can also rub the ghee on the upper lip below the nostrils, that is it. And as far as putting slain water like nasoclear, which is used for kids, you better consult with the doctor first, since yours is a newborn.