SLA can be quite toxic and has hazardous fumes, both during printing and cleaning. FDM also has micro particulate hazards during the printing process. Prining for children is a serious question mark age spending. 3D prints will fracture along printing lines, creating (Potential) chocking hazards.
The issue really comes down to trying to do an industrial process in a home and having restrictive parameters. I run 5 printers (Prusa x2, Bambu, FLsun, Monoprice.) I have a laser cutter as well. External ventilation system, air quality monitors, air filtration system 3 stage (Avelo3d), fire suppression, and an air purifier. Even with these precautions I still trigger the air quality sensors often.
You have to decide where what is safe. I would suggest a Prusa MK4 and the enclosure (prusa or other) with a 3 stage filtration and fire suppression. I dives the cost up substantially.
https://www.fastcompany.com/90269252/3d-printed-particles-can-embed-themselves-in-your-lungs-forever
Food-Safe 3D Printing: Design Tips, Materials & Finishes | Xometry Europe.