I went through this with both of my kids - they were intolerant of dairy and soy. If there is any way for you to nurse 3-4 times a day then you don't have to worry about a substitute milk - even with working full-time, if you nurse in the morning and then a few times in the evening that will be enough to meet his milk/fat needs.
Once he's over 2 years old then it's not as much of an issue b/c most of the brain growth is the first two years of life when the healthy fats are so important. If you cannot nurse that many times, then I would nurse when you can and supplement his diet with fatty healthy foods like avocado and coconut oil.
Milk-wise, you can do Rice Milk or Almond Milk but neither is a suitable milk replacement nutrition-wise for a toddler, it just works well as a beverage in cereal and cooking or with dinner. Also, drinking a large quantity of Rice milk isn't something I would feel comfortable encouraging a toddler to do because of the high levels of arsenic in rice (and rice products like rice milk). I also wouldn't do large quantities of soy milk for the reasons you listed.
So all that to say, in your same situation what I did was intentionally nurse until my kids were over 2 so that I didn't have to find a substitute. If he needs a beverage at daycare during the day, you could give him a sippy cup of rice milk or almond milk (or even coconut milk - though I found Rice Milk tasted closest to breastmilk) but I wouldn't give more than 6 oz of rice milk a day to a toddler.
HTH!
Last edited by Katigre; 04-07-2010 at 05:26 PM.
Mom of 4: Boy (10), Girl (7), Boy (4), Girl (2)