N.H.
Hi K.,
I have used soy milk with 2 out of 4 of my children. My son, now 8, drank soy milk because whole milk didn't agree with him at a year old - some vomiting, belly aches and he didn't like the taste. He has never had a problem with growth, learning, and is very healthy.
My youngest, a little girl, almost 3, was also on soy milk because she didn't like the taste of whole milk. I bought vanilla flavored soy milk by accident, and stuck with it for over a year. Now, she is on whole milk, and still doesn't like the taste, so I "flavor" it for her. I use about a teaspoon of flavored coffee creamer to her nap cuppy. She drinks out of a cup the rest of the day.
I don't think that giving your son soy milk for a few months to even a couple years would create a problem with estrogen. Maybe if he is still drinking it around his time for puberty, I might be a little more concerned about it. He is a fast growing boy and needs nutrition to grow properly, it is your job to give him that.
I have never heard that cows milk is not good for you. I was told that 2 % milk is better, but not bad. Kids do need certain things that you may be able to cut out when they become teenagers, but not when they are in the early years of growing.
It is your pediatricians job to know about nutrition, and keep up with what is new! If you doubt your pediatrician, find another one. Also, find yourself a child nutritionist,(not online, ask your dr. to direct you to one, or call a local hospital for a referral) then compare what they are both telling you, and ask them both about what the other says.
Please be careful about what you lookup on the computer!! I know someone who cut meat out of their entire diet because she read somewhere that they leave the meat out on a table for days at a time, but whoever posted that forgot to specify that it was a refridgerated room!! There are people out there who are paranoid and will listen to anything they read on the computer as if it were a bible. Then spread the bad word about nutrition, among other things.
good luck