In the french speaking Community you can contact La Ligue des familles (www.laligue.be) or ONE http://www.one.be
In the Flemish Speaking Community you can turn to Gezinsbond https://www.gezinsbond.be/en or Kind & Gezin http://www.kindengezin.be/
In the Brussels Region, there is a network for expectant parents and families in Belgium who are foreigners http://bctbelgium.org
All of these organisations will help you with any questions you have.
A list of NGOs in Brussels and Wallonia working in the social field supporting families:http://pro.guidesocial.be/associations
You can also contact a family planning center https://www.planningfamilial.net as they also provide support for families.
In Flanders, or as a Dutch-speaking in Brussels: http://www.fov.be/spip.php?article48 you can also contact a Centrum voor Algemeen Welzijnswerk http://www.caw.be/. These centers have doctors, psychologists, social workers, lawyers who can support you.