Yes there are many NGO’s across Brussels who are providing these services.
It’s absolutely free
You can cook and feed in the place
Kids will have lot of toys to enjoy by themselves instead boring in home
Only constraint they won’t open every day You can look below image for place and timings.
NOTE: AGE SHOULD BE <4 Years
You can always follow BABOES: https://www.facebook.com/pg/baboesinbrussel/