When I set up a play date with my five-year-old son and his three friends, it held the promise of an easy afternoon sipping coffee on the couch while this self-sufficient bunch played Batman. Instead, I found myself wiping three big-boy bottoms and coping with the drama of a tearful meltdown when one child soiled his pants. That day taught me that while most preschoolers are toilet trained, plenty still have a ways to go before they achieve complete independence in the bathroom. Here’s what you need to know to overcome the challenges along the way.

Challenge # 1: Holding at first base

Learning to pee on the potty is pretty smooth sailing for lots of little kids. The bladder has a muscle that acts like a gate to hold urine in, and the brain learns to tell it to stay closed, explains Dr. Henry Ukpeh, a clinical assistant professor of pediatrics at the University of British Columbia and a spokesperson for the Canadian Pediatric Society. Most kids hit that milestone between two and three, but it can take a lot more effort — and patience — to get them to poop on the potty. And there are plenty of reluctant trainers who will fight part or all of the process for years. If your child falls into this category, you may want to check with a pediatrician to rule out developmental delays or kidney issues, says Dr. Ukpeh, but chances are your kid simply becomes engrossed in an activity and forgets he has to go. Or it could be that a real power struggle has developed between trainer and trainee.

You can: Try an incentive system to get your kid the rest of the way there, create excitement about completing training with novelty underwear (“Let’s keep the Bob the Builder clean and dry!”) or let him sit on the potty with a diaper on to get the feel for sitting and pushing. Whatever you do, don’t punish or humiliate your child. Instead, gently appeal to his need for social acceptance by pointing out that his friends, teachers, heck, even Diego all use the toilet. Meanwhile, pack a change of clothes and use regular, unemotional reminders, says Dr. Radha Jetty, the chief resident of pediatrics at Ottawa’s Children’s Hospital of Eastern Ontario. Chances are it’ll gel before long.

Challenge # 2: Getting the night right

Just when the whole family is finally sleeping through the night, you may find yourself stripping sheets and loading the washer at 3 a.m. That’s because learning to control a bladder at night often takes longer than the rest of training, and it may also depend on some physiological factors, such as bladder size, explains Dr. Jetty. The message to both parents and kids is, relax! Busy children are deep sleepers, and many wear Pull-Ups long after saying sianara to diapers during the day.

You can: Limit fluids before bed, make a “goodnight pee” the last thing your child does before bed, encourage her to get up to use the toilet at night (nightlights may make the trip easier to navigate) and meet dry mornings with hearty congratulations.

Challenge #3: Conquering the big toilet

If your kid began on a little potty, it won’t be long before you’re dying to be done with cleaning it out (or seeing it in your living room). But to a child accustomed to a pint-sized pot, that grown-up toilet may look like cold, white, porcelain fear — inconvenient when you’re at the grocery store. Anxiety over being swallowed by the big toilet is common, says Dr. Ukpeh.

You can: Buy your child a brightly coloured seat insert to help reassure her that she won’t fall in and a stool to help keep her feet firmly planted.

Challenge #4: “I need you!”

All the pleases and thank yous in the world can’t rival a self-sufficient bum wiper as the perfect preschool houseguest. But getting your child to wipe effectively without flushing an entire roll of paper down the toilet can be a trick.

You can: Try demonstrating a good wipe — always from front to back — on a doll, suggests Dr. Ukpeh. Supervise your child for the first few tries and be sure to reward a clean tush with loads of praise. Or give flushable wipes a try. There’s no evidence they teach kids to wipe any faster — and they come with a higher financial and environmental price — but they’re soft on little bottoms and might do the trick. Brightly packaged kids’ hand soap might build enthusiasm for washing hands.

Sam Sacks is a Toronto writer and mother of three with one potty trainee left to go.

Just getting started?

Pick your timing. If a new baby is about to arrive or your child has just switched to a new daycare, stars will not likely align in your favour.

Plan your approach. You may have to revise it along the way, but you and your partner should agree on a strategy and keep your messages consistent.

Create excitement around the purchase of a potty chair or seat insert, stepstool, big-kid underwear or even a book or two about using the potty.