Constipation is one of the most common pediatric referrals in infancy
Rome IV criteria are the right diagnosis tools
Infant must have 1 month of at least 2 of the following symptoms:

• Two or fewer defecations per week
• History of excessive stool retention
• History of painful or hard bowel movements
• History of large diameter stools
• Presence of a large fecal mass in the rectum

In toilet trained children the following criteria can be used:

• At least 1 episode/week of incontinence after the acquisition of toileting skills
•  History of large diameter stools which may obstruct the toilet