Pfizer and Moderna are both approved for that age group. Pfizer is a 3 shot series, Moderna is only 2. Otherwise they're very comparable, but you can definitely talk to your doctor about options. Your office may only have one type available. Here's info on both options: https://www.chop.edu/what-know-about-covid-19-vaccine-children-under-5
Re: Covid Vaccine for 9 months old