A study published in our American Academy of Pediatrics journal showed significant improvement in fussy crying in babies receiving the probiotic

Lactobacillus reuteri which is available as BioGaia Probiotic Drops.

At the 28 day mark of taking the probiotics, the average crying time had decreased from 159 minutes a day to 51 minutes a day and  95% of the study participants had significant improvement in crying time.