If my child is less then 6months old can i still clame him

[Carl]

If your child was born in 2017, even one minute before midnight on new year's eve, you claim them as your dependent. When asked, you select the option to indicate they lived with you "the whole year".

[Anita01]

If your child was born during 2017, you would choose that he or she lived with you all year and you would qualify for child-related credits