Hello. My son is 2 months old. He has been vomiting after feeding for…

Hello. My son is 2 months old. He has been vomiting after feeding for about a month now, sometimes even in fountains and multiple times. The pediatrician said that he's gaining weight so it's not a big deal ??‍♀️??‍♀️but I worry that he's hungry and isn't eating enough because he keeps asking and it goes in a circle.