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Infant constipation is not very common. However, your baby might have infant constipation if he or she has: hard or pellet-like bowel movements, bowel movements that appear difficult to pass, causing your baby to arch his or her back or cry.
https://www.findatopdoc.com/Top-Videos-and-Slideshows/10-Ways-to-Relieve-Constipation-in-Newborns