Yes for first year of life 2 doses necessary Followed by yearly one shot of flu

Hello. You need to get your baby vaccinated with flu vaccine 2 doses 4 weeks apart for first time vaccination. Thereafter, you need to give flu vaccine shot once every year to fight against new strains that emerge every year. It doesn't give lifetime protection as you need to get your kid vaccinated every year. It decreases the frequency and severity of viral infections  in future.