Do I need a second opinion?

My lo just turn 3 months. And he throws up frequently. After every feed and in between feedings. In total up to 3 times in the hour.

I have a concern about that because it is so much tines.

I went to the doctor on Friday and he Weight 12.6 pounds. And his normal provider said he wasn’t up to the standard weight. He wasn’t far off but he wasn’t up to it.

So she prescribed Zantac to see if that will help.

But it is now Thursday and he is still throwing up.

I didn’t get to see his normal provider.

The one I saw well she said he is fine and gaining weight appropriately. He still weight the same as Friday.

Anyway I am just trying to see if I am just overreacting or I should be more concern?