Review of several studies, although small revealed that if children are exposed to indoor insecticides (ex. home, school) there is a significant increase leukemia and lymphomas risk. You can control what chemical are used in your home as pest control but do you know what is used in kindergarden school or daycare? Use of pesticides beyond irritating your skin/eyes and effecting your hormone balance can result in cancer. A site worth visiting is National Pesticide Information Center.
NOTE: There was no statistically significant association between outdoor pesticides or outdoor insecticides and childhood cancer in this study.