Amending after you file will get you the credit, as long as the social security number is issued timely. As pointed out above the retroactive claims depend on the timeliness of the social security number or ITIN, not the return itself.
It is best to file the original return with the child's social security number listed, but this is not always possible.
The extension is very important in this case to allow for the additional time to receive the social security number and preserve the ability to receive the credit.
A properly filed extension remains on file even if the tax return is submitted prior to the extension filing deadline.
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