We can make something more personal for the babies. Maybe an anklet, or something. Same make as the amulet, but smaller and safer for children.
As for the complex protection, the building has got rock salt lined along built-in grooves on the floors, along with Devil's traps strategically painted in all kinds of places throughout the building. I'm not sure how well acquainted you are with the things that protect you from demons and spirits yet, but both of those things will keep the demons out. For extra measure, we've had various witches and wizards place all kinds of protective magic on the place and, if magic isn't your cup of tea, the complex has got a security system created by some of the most talented tech people out there. Monsters might come at people outside the building plenty, but that complex is definitely the safest place in Lawrence.