I got our "first" boxer when our youngest child was merely 2 mths old. I bought a pup.. to bring into the family and "grow up" with our children. We still have that "pup" to this day, he has always been really careful around children (he is 7yrs now), BUT we also adopted a 5+ yr old female a few mths ago.. and she is just as wonderful around the children as he is, and she has been held in a dog pen all her life. We also have a girl who is almost 2, and she has the same feelings for the kids as the other two boxers do.
IMO, boxers love children.. its in their nature...
My 100 (almost) lb. male Boxer tip toes(always has) around the kids .. makes ya really appreciate this breed.. they are the BEST!!