what are the best baby products i can use for my 3 months old son in doha?

Since you will be moving soon I would suggest to you some reading to do to have an idea of what you will find:

http://www.qatarliving.com/qatar-guide

http://www.qatarliving.com/answers/cost-of-living/how-much-should-i-expect-to-save-in-20000-pm

http://www.qatarliving.com/node/57011

As well as doing a search can provide you with lots of answers to your queries/questions. Remember first search and the if you don't find it then post a question.

On the other hand if you wan to to know about availability of :baby food, baby clothing, baby toys as well as other items baby-related; then there is no prob here in Doha-Qatar there are plenty of supermarkets, convenience stores, small shopping markets and baby dedicated stores that will help you find and see "some" variety of items for your 3 month old.

Also remember babies must be in control with a pediatrician in order to guarantee that proper food, medicine, and suggestions and seleccted items are appropiate for him/her.

Going into details would make this post too long and instead you can search and will provide you with more ideas.

Regards!!