There is a much higher risk of your child getting hold of your AirTags at home than someone else's. I personally wouldn't be all that worried about that as I feel the risk would be exceptionally low. I don't particularly worry about other similar devices that have the same flaw that belong to other people as my childrens' window of opportunity to do serious self harm is very limited.Completely flawed logic since by their very nature Airtags bought by other people are likely to turn up all over the place.
My primary concern would be me or my wife bringing them into our house where they would live most of the time and having a battery compartment that reports suggest vary from kind of fiddly to trivial to open depending on who you talk to.