Okay so I found some info on orphan experimentation in the US during the 20th century.
Kids used as lab rats
This article is a great source for such unethical studies.
Waltham, Mass., 1950's- 'the science club' children were bribed with Mickey Mouse watches
There was the Massachusetts School for Idiotic and Feeble-Minded Youth that experimented on orphan boys in the late 40's/early 50's by giving them radioactive oatmeal. They endured six blood tests a day and four urine samples. This experiment wasn't known to the public until 1993 so there is no telling what others could still be secret.
Philadelphia, PA., early 1900's- tuberculosis studies on 3-4 year olds
Via the article it shows they did experiments in a Philadelphia orphanage.
"In the early 20th century, researchers seeking a cure for tuberculosis dropped a solution with tuberculin into the eyes of 3- and 4-year-old children at the Catholic St. Vincent’s Home for Orphans in Philadelphia. The result was nauseatingly predictable, as the children would “lie in their beds moaning all night from the pain in their eyes.” In a similar study, some of the children had their hands bound for the first 12 hours, so they wouldn’t rub their eyes."
30 years later were these same orphanages stilling doing experiments on orphans?
Quebec, Canada, 1940's-1950's- '
Duplessis Orphans' wrongfully commited to psychiatric institutions and used as guinea pigs to test out new drugs
The Worst of Times - How Psychiatry Used Quebec’s Orphans as Guinea Pigs | Freedom Magazine in Canada
According to the article when they would falsify records.
"When children died, he explained, as yet unidentified persons within the psychiatric system simply came up with phony new identities, fabricating records to replace those deceased so funding could continue. “Some of these kids died and were reborn 10 times,” said Lebel, now a freelance journalist."
Could neglected orphans who died in other orphanages also have falsified records?
.here is another article on child experimentation from doctors who are from the Children's Hospital of Philadelphia.
Looking back at medical experiments on kids