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Quick Answer. Prune juice takes different amounts of time to relieve constipation depending on the severity of the problem. Prune juice starts working within an hour and can take an hour, six hours, a week or several weeks for a lazy bowel, according to Total Health. Continue Reading.
Feed your toddler diluted prune juice. This is a very natural treatment for constipation in infants, and safe for babies older than 6 weeks. The measurement is 1 ounce prune juice and 1 ounce water; mix and feed the baby two times a day. The sugar in the prune juice encourages bowel movement in the baby.