It is difficult to be certain about the cause of these pimples on your baby's tongue and in her mouth without being able to see her. The most common cause of this is a virus infection of the mouth and tongue known as Herpes stomatitis. This causes rather painful sores in the mouth and on the tongue and most babies cannot drink or eat properly once they have this infection. You can try applying Teejel oral gel to the pimples in your baby's mouth twice or three times a day. If she starts refusing to drink or eat she must be seen at a paediatric clinic as she runs the risk of becoming dehydrated. This infection usually lasts for 10 days.
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