(Not sure if this is the right topic or not...)
I try really, really hard not to judge people's parenting, but when I recently found out that some (very distant) family members were using the CIO method on their 4 week old daughter (up to an hour!!!), I couldn't help but say OMG. In my opinion, that's just way too young!
ETA: This bothered me enough to consider saying something (nicely), but in the end, it sounded like they had done their research and this was their decision so I let it be.