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Child Benefit
Apply to who pays you. Either CPAS or your payroll provider.
It's true that some times people could have easily googled the information they're looking for and see the results in seconds within the time they log in on xpats, add a question in the Q&A section and wait for someone to give them the spoon...
Google > apply+child+benefit+belgium, first result gives you the info:
https://www.svb.nl/int/en/bbz/kinderbijslag/kinderbijslag_be/
But J still replies.. ;)
It is ironic though that to find the info in English you have to refer to a Dutch website :D
The child allowance is paid by your 'caisse d'allocation familiale' via the payroll in case you are employed in Belgium. The application is done by the father (unless the father is unknown or not employed in Belgium), but the allowance is usually paid to the mother. You can ask from HR/Payroll or find the info and download the application forms directly from here: http://www.rkw.be/Fr/0to25/how.php
If you are self employed you'll be paid by INASTI, info in here http://www.inasti.be/fr/selfemployed/familyallowance/index.htm
"The application is done by the father"
The application can be done by either, but not both.
If one partner is a Belgian employee and the other one is not (freelance / diplomat), then it makes sense to choose for the employed partner to apply for it, even if the children are tax-dependent on the other partner.
Actually weirdly enough it is explicitly the father who is supposed to apply, quoting the ONEM website. Only if the father is not part of the Belgian social security system (= not employed, unemployed,on a long term sick leave or on a pension in Belgian system) the mother applies. Similarly the allowance is paid to the mother unless otherwise requested or in case the child does not live with the mother.
If you're coming from another EU country and claimed child benefit there, they'll usually ask you for a special form from the other EU country to confirm no child benefit is now being claimed there for the same children.
Ask your local Belgian sickness insurance or doctor.