The card does not describe how to introduce flaxes into the diet if little fibre has been eaten so far. The manufacturer suggests making mini sandwiches: a little cheese, grated carrot or curd on a flax. The portion size is not stated.
General information (not a manufacturer's instruction): when increasing the share of fibre in the diet, the amount is increased gradually and enough fluid is drunk; in case of digestive problems, a doctor's consultation is needed.