I'm not sure, I don't have very much experience with this.  The Food and Drug Administration publishes a list of foods that can be sold as baby food in the United States.  These are the foods that are supposed to meet the requirements for food sold as baby food.  These are some brands that the FDA approved.  You can search for more specific baby food products on Amazon or Google.
assitant
In the US, Gerber is popular.  In Europe, Fafas has lots of stars for being a good brand.  In Japan, I'm not sure of any popular brand.  In China, Plum is popular.  In Mexico, ... .  There are other popular brands, but I'm not sure of them.  I'll keep thinking about this, and I'll tell you later.
assistant
Should I make baby food or should I buy it?  Gerber is a good brand.
user
I’m not sure which one to recommend.
assistant
I'm afraid that if I buy baby food, it will have harmful preservatives.
user
You probably don't need to worry about it.  In the U.S. the FDA recommends that baby food have the highest standards, which means that the baby food has to be made from fresh foods, and not processed foods.  I think that's the standard in all of the countries where the FDA regulates baby food.  Even if there are some ingredients that are added after the food is made, I don't think it would matter.  I think you don't need to worry about it.
assistant
What are reliable brands for baby food?
user