Child Benefit Online ..unravelling child benefit

how do I apply for the child tax benefit?

I need to apply for the child tax benefit for my son who is 4 months old

Here is the link for the part of the CRA website that has all the info about eligibility for the benefits and how to apply. It covers most of your commonly asked questions. Remember that you (and your spouse, if applicable) must fill out an income tax form every year if you want to continue receiving benefits.

http://www.cra-arc.gc.ca/benefits/cctb/faq_qualifying-e.html#q6

You have to fill out a form and send it in. Here's the link:

http://www.cra-arc.gc.ca/E/pbg/tf/rc66/rc66-06e.pdf

To find out where to send the form, use this link and click on your province:

http://www.cra-arc.gc.ca/contact/tso-e.html

I hope this helps. =)