Here's a little more background. The stools before the diarrhea (at 4 month) were just fine, I'm sure there was no such kind of worms. The baby is nursed mother's milk, with occasional formula to supplement Vitamins. So I am also sure it's not some undigested food.
Everything was fine during pregnancy. We basically don't eat raw foods. It cannot be an infection during pregnancy and grow out after 4 months.
We take every caution of hygiene, except the grandparents take the baby out and might touch something suspicious.
I also suspect it's hymenolepis, especially Dipylidium caninum. We have a lot of squirrels here. One of the photo I post actually show something like head with suckers, but I am not quite sure .The general condition of the baby is still fine, seems not affected by the worms at all. I remember he got a lot of rash on his back and the back of his arms and neck. No idea if it's related to the worms.
I don't trust the lab (Healthpartners Como Clinic, Minneapolis). Before, our sample was ignored there, and this time, they reported negative even we can see the worms by naked eyes! I keep searching in internet since the worms found, but not promising.
My son pooped just now, with about 10 worms, slightly increased.
I uploaded a photo of the diaper (on 5/22/07) at:
And microscope video at: