hello and welcome,
is the inflammation of the gums leading to redness
, pain , bleeding , swelling of gums .
Infection of the gums leads to fowl mouth odour which is mainly caused due to deposition of bacterial plaque, calculus or other irritants like food debris.
your Baby is really very young and in her case , gingivitis is mainly because of stress due to improper sleep, poor oral hygiene
i would suggest you to maintain her oral hygiene nicely by regular brushing and mouth rinsing with lukewarm saline water.
visit a dentist
for clinical evaluation , a course of doxycycline for 3 to 5 days helps subside the symptoms but do consult a doctor before any medication.
i hope this helps,