Glycerin Infant Supposotories provide relief of occasional constipation in infants.Suppository. Glycerin (Glycerol) Suppositories BP 1g Infants is an easy and effective way to pr your baby with relief from constipation and works by encouraging bowel movement- helping to relieve any pain or discomfort they might feel due to not being able to pass stool. These suppositories are safe and simple to use and will dissolve in a matter of minutes, providing your baby with fast and effective treatment.