All three of my kids were different in potty training.My 12 yr old was potty trained at 18 months.I never had an accident with him.He was a real gem.
My 5 yr old was 2 and 1/2.Almost three.I had him almost potty trained then the babysitter stopped talking him to the

room and left the diaper on all day.He regressed bad.I ended up changing babaysitters because of this.It took him alot longer the second time around and alot of accidents.
I had two in daipers that wre two years apart.That was not fun.
My youngest,my 3 yr old was just potty trained earler this year.She turned 3 in August.She was the hardest,the most bullheaded child I have.She takes her time at everything she does.I ended up giving her a sucker every time she went on the potty until she was trained.