I notice that my 2-5-month bub is refusing my breast, what seems to be wrong?

Without warning a normally great-feeding 2–5-month-old may start to refuse the breast by screaming and/or pulling off your boobs. This might be caused by a change in your milk flavour due to menstruation, ovulation, contraception or pregnancy(!); or it could be baby’s impatience to wait for the milk let-down. If you can persevere through these stages, things usually come right again.