AND RELEVANCE Although L reuteri may be effective as treatment for crying in exclusively breastfed infants with colic , there is still insufficient evidence to support probiotic use to manage colic , especially in formula-fed infants , or to prevent infant crying .
IMPORTANCE  Excessive infant crying  is common , distressing , but without proven effective prevention or management options .
Probiotics may be a promising solution .
OBJECTIVE To examine whether probiotics are effective in the prevention/management of crying ( " colic " ) in infants 3 months or younger .
Infantile colic: crying time reduction with a whey hydrolysate: A double-blind, randomized, placebo-controlled trial.
OBJECTIVE To determine the effectiveness of whey hydrolysate formula in the treatment of infantile colic in a primary care setting in the Netherl and s. STUDY DESIGN R and omized , double-blind , parallel trial with a 1-week qualification period and a 1-week intervention period . Participants . Forty-three healthy , thriving , formula-fed infants , < 6 months old , crying > 3 hours per day on at least 3 days per week . Infants were r and omized to whey hydrolysate formula ( n = 23 ) or st and ard formula ( n = 20 ) . MAIN OUTCOME MEASURE Difference in duration of crying ( minutes per day ) between qualification week and intervention week . RESULTS Analysis according to the intention to treat principle showed a difference in the decrease of crying duration of 63 minutes per day [ 95 % confidence interval : 1 - 127 minutes per day ] in favor of the whey hydrolysate formula .  Five infants did not complete the trial . The scope of the study was not sufficient to expect significant differences in the subgroup analyses . CONCLUSIONS An extensively hydrolyzed whey formula is effective in reducing the duration of crying in a primary care setting
AND RELEVANCE Although L reuteri may be effective as treatment for crying in exclusively breastfed infants with colic , there is still insufficient evidence to support probiotic use to manage colic , especially in formula-fed infants , or to prevent infant crying .
IMPORTANCE  Excessive infant crying  is common , distressing , but without proven effective prevention or management options .
Probiotics may be a promising solution .
OBJECTIVE To examine whether probiotics are effective in the prevention/management of crying ( " colic " ) in infants 3 months or younger .