so 29 days ago I gave my son who is 4 the flu shot for the first time in his life. and apparently since he is under 9 and had never had one until than, he needs a 2nd dose... on baby center it says "Kids 6 months through 8 years old who are being vaccinated for the first time, or who have previously received only one dose of vaccine, need two doses at least 28 days apart." well tomorrow makes 30 days since his, and now I'm wondering If it may be too late !?! why did his doc not tell me this wtf!