Health canada requires that infant teether fillings not contain any living micro-organisms .
加拿大卫生部要求婴儿固齿器的填充物不能含有任何存活的微生物.
However , the bacteria can affect children with weakened immune systems , causing stomach pain , vomiting , and diarrhea , if the teether is punctured and the liquid from the teether is ingested .