@Gelati: no virus is good news. Are you using Nan LI now? I think a bit of lactose is fine since you didn't seem to have problem when mixing with rice water.
DS certainly didn't have gastro to start with but i think his gut has become so sensitive over time (6 months of surffering!). Yes, 3 months is a good plan. If DS really has real lactose problem, which is likely from what we had been experiencing in the past 6 months, a friend suggested us to hold off re-introducing it until 1 yr old. I described everything to this friend and she told me that the symptoms are exactly like her second DD. Her DD was on aptamil de lact until 1 yr old. They re-introduced it but she still couldn't handle it. Now, the paed told her to wait until 4 yrs old. I will see how things go.....i probably won't want to rush back re-introducing lactose into his diet. This has been a nightmare for us. It is so hard to diagnose because all symptoms are so similar to one to the other (colic, lactose problem, cow milk protein allergy etc).
DS got the cold from childcare for sure. I think it is good for his immune system. Of course, as long as he isn't getting the flu!