An inconsolable baby is one of the toughest things a new parent has to deal with.
But now an international study has discovered a potential aid for easing the crying of babies with colic - a probiotic supplement that can reduce crying by about half.
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Colic causes babies to cry excessively, but it's not known exactly why. Crying can be called 'excessive' when a baby cries for more than three hours a day, three days a week, for three weeks.
Breastfed babies given the probiotic for three weeks were twice as likely to halve their crying.
However, the treatment is not currently effective for formula-fed babies with colic.