I presume that your baby niece is not being breast fed. It is very seldom that a young baby becomes constipated while on breast milk. If baby is being breastfed then she should be seen by a doctor as certain conditions especially one called Hirschsprungs needs to excluded. If baby is being formula fed then you should change the formula to Lactogen1. If the constipation persists while on Lactogen please write to me again.
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