Animal attacks are on the rise, as can be seen in this story from England. Many more examples can be offered in supposedly "modern" countries, especially the United States.
More and more animals are moving into suburban and urban areas. Always keep your children safe and don't "assume" all will be well, even in their own room. In this instance mom left the backdoor open for some fresh air and a fox wandered in, went upstairs and mauled the two twin infants in their beds. A screen door for $75, or a well maintained fence would have saved the entire family a lifetime of grief.
Do a walk around of your house and property, and look for evidence of local animals passing through. Protecting your children is 90% offense and only 10% defense. Think ahead, plan ahead and keep the lil' ones safe.