To potty train a 2.5 year old let them drink and eat as normal.
And put the 2.5 year old in training pants or underwear and do away with the regular diaper if you want too.
Put them in easy to remove clothes or leave them in underwear or training pants.
Then every 15 to 20 minutes take them to the toilet or to a potty chair and have them sit their for a few minutes or so until they pee or poop.
Watch for signs they are about to poop or pee and then take them to the toilet or potty chair.
Praise the child for going potty in the toilet but don't punish them if they have an accident and don't make it.
Allow them to eat, drink and play as normal, but every 15 minutes or so put them on the potty.
At the end of a session, revert back to a diaper or pull-up and go on with your day.
When you get home, have another session. On the third day, go for an all-day session.
When a toddler refuses to wear a diaper then basically they have 2 choices.
Those 2 choices are to either wear the diaper or use the toilet.
If your toddler is refusing to wear a diaper it could be a sign that your toddler is ready to use the toilet and is uncomfortable in their diapers.
So if your toddler is 18 months or older and is refusing to wear a diaper then first try and introduce your toddler to the toilet.
If they refuse you tell them straight up that it's either the toilet or they have to wear diapers.
Sometimes you have to simply fight with the toddler and hold them down while you change their diaper and put it on them.
Some toddlers go through a phase where they have having their diaper changed and sometimes you have to literally wrestle them into the diaper and then you can also use footed pajamas that zip in the back or hard to remove pants etc.
Another thing you can do is to run some duct tape or packing tape around the diaper to keep the diaper on the toddler.
Eventually this will pass.
A 2 year olds diaper usually needs to be changed every 2 to 3 hours.
It depends on how much the 2 year old drinks and how often they pee.
Some 2 year olds may go an hour or so before peeing and so they can usually go 2 to 3 hours between diaper changes.
Some 2 year olds may only need a diaper change every 4 hours as well as they may only pee every 2 hours.
My 2 year old boy would sometimes go 2 hours without peeing so he was fine in a diaper for 4 hours on some days before he needed a diaper change.
As long as you're changing the diaper every 3 to 4 hours on a 2 year old then you're doing fine.
Of course if they poop the diaper should be changed as soon as you notice.
At 2 years old they usually go through 4 to 5 diapers per day although some may use more.
Using a good quality diaper such as pampers or huggies means you won't have to change diapers as often and they will keep your child's skin dry and healthy.
When changing a baby girls pee diaper you do need to wipe them at least once.
Although if the baby girl is wearing disposable diapers most of the pee is kept away from the babies skin.
But still a bit of pee can be on the babies skin especially if the diaper is full of pee.
So it's always a good idea to wipe the baby girl or even a baby boy at least some when changing a pee diaper.
You only usually need one wipe to wipe them down good enough.
Or you can also use a wet washcloth to wipe the baby after a pee diaper.
The pee can stagnate on the skin and cause rashes as well.
Bacteria that could be in the pee could eventually lead to infections in the baby girl and sometimes a baby boy as well.
I've always wiped both my baby girl and baby boy down even after a pee diaper as I always wipe when I pee and wouldn't want to have old pee on my skin.
It doesn't take that much longer to simply wipe the pee off the skin and it keeps their skin healthy and keeps them from getting rashes.