Thad: it just has to be AT LEAST 4 weeks in between, longer is okay.
Every child needs two shots when it's their very first time getting the flu vaccine- even if they are a bit older. To pp that didn't hear about a second- I would call your pedi and ask to schedule an appt for 4 weeks after the first.
My kids didn't get it. we can't get shots at the doctor because our insurance is terrible, and then she got sick, and then really sick. I'm actually waiting to get the shot for myself right now.
The news is saying it's getting better in the south, so hopefully we dodged it. My niece's not-quite-boyfriend's friend died from the flu last week, but that was in minnesota.