Hi,
There is no problem as there is full name given on the COPR of your your child. During the brief inerview with the immigration officer while landing in Canada POE you can inform this matter to him and he would update the omissions accordingly if there is. So, go ahead and prepare for moving to Canada at the earliest convenience. Welcome to Canada!!.
Of course you can get any correction done by the visa office. But it may take time up to one month or more.