We lost our daughter to ALL. It's quite hard to read anything like this without thinking what could we have done differently.
If it helps, you are far from alone. My sister lost her son to SIDS - just months before the American Academy of Pediatrics reversed their recommendation from putting babies to sleep on their stomachs to their backs. In one book I read a doctor described how his decision to go to medical school was shaped by holding a dying child he could do nothing for - and he learned the treatment in medical school and had had the materials on hand. I read a heartbreaking interview once with a doctor whose brother died of an infection not long before antibiotics came on the scene which would have made it trivial to treat. I've seen reference to similar accounts from Civil War surgeons who only realized how many their lack of cleanliness killed after Joseph Lister published in 1867.
These examples could easily be multiplied a hundred-fold.
We do the best we can. Learning improves our future. Nothing can change our past.
I am sorry for your loss.
As someone has said further down - this is one theory and isn’t a general medical consensus.
Our daughter was diagnosed with ALL 12 months ago. She went to baby groups from 6 weeks and I would never have claimed our house was particularly clean.
What I have always found frustrating is we have never been asked any environmental questions about our daughters early years. There are many theories of cause so I would have expected them to get as much information as possible from us.
Google and Facebook could redeem themselves by putting some resources into looking for statistical patterns in their massive datasets. Finding the smoking gun for Parkinsons or prostate cancer would go a long way to making their data-collection more socially acceptable.
Please take this study with a grain of salt and don't beat yourself up based upon it.