Is it okay if I do not give my toddler the second dose of the flu vaccine?

According to the CDC, not all children need the 2nd dose, but "Children who only get one dose but need two doses can have reduced or no protection from a single dose of flu vaccine" so better to stay on the safe side and get the 2nd dose if your PD recommends it. http://www.cdc.gov/flu/protect/children.htm