I have to agree with cora. Those photos fit under the cestode umbrella of multisegmented flatworms. Most people only think of the big white Tapeworms such as saginata but in reality there are many many more. Also, while saginata, cosidered the most common are considered benign ... others of the "Dwarf" type can be quite dangerous, particularly echinococcus which causes hydatid disease. The eggs are very resistant to both heat or freezing. Its very important to differentiate between the two types because the treatment is completely different. There are blood serology tests for this. If this is the case, its difficult to say where the baby make have been infected. The most likely vector would be maternal, as environmental exposure at this stage for the baby is minimal. Maternal transmission of parasites seems to be a taboo subject, but in veteranary medicine it is widely accepted that pregnant animals give birth to infected babies... hence it is recommended to deworm animals before or during pregnancy and the babies shortly after birth. The disease does occur in the US mostly in the north and MW and is currently on the rise. Very common in dogs and wild animals (carnivores). I would get a stool testing kit for those specimens, or even preserve some in alcohol until then. Although most labs will not accept with EtOH, but its better than nothing. I would contact the cdc for testing info.