Glycerin suppositories or rectal stimulation with a lubricated rectal thermometer can be used if there is very hard stool in rectum, but may cause irritation and develop tolerance.
Not yet begun solid foods
Sorbitol-containing juices (eg, apple, prune, or pear)
For infants four months and older, starting dose: 2-4 ounces of 100-percent fruit juice per day
Karo syrup, add 1 tsp to 4 oz cooled, boiled water; give 1 oz of solution to baby just before feeds twice a day until stool softens
Who have begun solid foods
Sorbitol-containing fruit purees (e.g. pureed prunes).
Substitute multigrain or barley cereal for rice cereal
Sorbitol-containing juices (eg, apple, prune, or pear)
For infants four months and older, starting dose: 2-4 ounces of 100-percent fruit juice per day
Karo syrup, add 1 tsp to 4 oz cooled, boiled water; give 1 oz of solution to baby just before feeds twice a day until stool softens
Sorbitol-containing fruit purees (e.g. pureed prunes).
Substitute multigrain or barley cereal for rice cereal
WITHOUT withholding behavior, bleeding, or anal fissure
Fiber: age + (5 to 10) grams daily
Adequate fluid intake: 32-64 ounces [960-1920 mL] per day
WITH withholding behavior, pain while defecating, rectal bleeding or anal fissure
Polyethylene glycol 3350(e.g., Miralax) 0.4 gms/kg/day MAX 6 days
Fiber: age + (5 to 10) grams daily
Adequate fluid intake: 32-64 ounces [960-1920 mL] per day
Polyethylene glycol 3350(e.g., Miralax) 0.4 gms/kg/day MAX 6 days
Constipation 
Constipation
Dysuria
Hirschsprung's disease
Dysphagia
Congenital anorectal malformations
Hiccups
Imperforate anus