My wife and I raised six children...all potty trained at different ages...NON were younger than two when fully trained...
Someone correct me if I am wrong, but I don't think 3 month old have the physical ability to control themselves...
I couldn't say for sure on that, but they're certainly not "toddlers." A lot of 3-month-old babies can't even roll over, much less get up and walk to the toilet.
As my mother used to say, regarding stories of children's being toilet-trained at very young ages, "They mean the mother is trained."
Me neither. maybe a year or so but not 3 mos.