"What age should we start potty training?" It's the first question almost every parent asks, and it's the one we got wrong the first time. We picked a date based on age and what other families were doing, not on what our child was actually showing us. It took months.

With our next two, we flipped it around. We watched our child first and let the calendar come second. Both trained in about a week. Here's what we learned about age, readiness and how to decide when to begin.

Many kids start potty training somewhere between about 2 and 3 years old. Some show interest earlier, around 18 months. Some aren't ready until after 3. All of that can be normal.

So age gives you a rough window. It doesn't tell you the day to start. For that, you need to look at your child.

If you ever have questions about your child's development, or you're worried they're behind, talk to your pediatrician. They know your child and can give you real guidance.

Two children with the same birthday can be months apart in readiness. Potty training uses several skills at once:

• Body awareness. Noticing the feeling of needing to go, and holding it for a short time.
• Communication. Telling you, in words or signs, that they need the potty.
• Motor skills. Walking to the bathroom, pulling pants down and up, climbing onto the seat.
• Following directions. Remembering a simple routine with a few steps.
• Wanting to do it. Some interest or pride in being "big."

Those skills grow on their own timeline. A child who talks early might not care about the potty yet. A child who's quieter might be very aware of their body. That's why one number can't fit everyone.

We looked for a cluster of signs over a couple of weeks, not one perfect moment. If you're seeing three or four of these regularly, it may be a good time to start.

• Stays dry for an hour or two during the day.
• Wakes up dry from naps sometimes.
• Has fairly predictable poop times.
• Hides, goes quiet or squats when pooping.

• Tells you after they've peed or pooped.
• Asks for a diaper change or tugs at a wet diaper.
• Has words (or signs) for pee, poop and potty.

• Can walk to the bathroom and sit down on their own.
• Can pull pants down and up, at least partly.
• Follows two-step directions like "get your cup and bring it here."

• Follows you or a sibling into the bathroom.
• Wants to wear underwear like an older kid.
• Gets excited about potty books or videos.

Readiness also means knowing when not to start. We'd wait a few weeks if:

• Your child strongly refuses or gets upset when you bring up the potty.
• There's a big change happening, like a new sibling, a move or a new daycare.
• Your child is sick or just getting over an illness.
• You don't have the time or energy right now. A busy holiday week or a stressful work stretch makes it harder for everyone.

Waiting isn't failing. A few weeks can make a big difference at this age.

Here's the simple process we used with our second and third kids.

1. Watch for two weeks. Keep a quick note on your phone or a printed cue tracker. Jot down dry diapers, poop times and any interest.
2. Count the signs. If you see three or four signs regularly, start planning. If not, check again in a few weeks.
3. Pick a start date. Choose a long weekend or a few days when you can stay home and focus.
4. Prep the week before. Get the potty set up, catch up on laundry, prep easy meals and read potty books together.
5. Start with a calm plan. Stay home for the first few days, offer the potty at regular times and keep the mood light.

Some families start around 18 months, especially if their child shows strong interest. That can work. Just expect it to take longer and to need more help from you, since younger toddlers may not hold it as long or tell you as clearly. Keep it relaxed and pressure-free.

A gentle middle ground is "potty exposure." Let your child sit on the potty at natural times, like before bath, with no expectations. That builds familiarity, so when they are ready, the potty already feels normal.

If your child is closer to 3 or older, you're in good company. Older toddlers often train quickly because they understand more, communicate better and have more control.

The main thing that changes is motivation. An older child may need more say in the process. Let them pick their underwear, choose between the little potty and the big toilet, and help put stickers on their chart. Ownership goes a long way.

If your child is well past 3 and showing no interest at all, or you have any concerns, it's a good idea to mention it to your pediatrician.

Maybe you saw the signs, you started, and it's just not clicking. Here's what we'd try:

• Check your prompting. In the first week, most accidents happen because nobody offered the potty in time. Set a timer for every 30 to 45 minutes.
• Look at the clothes. Overalls, tights and tricky buttons slow kids down. Stick with elastic waists.
• Lower the pressure. If your child is crying or fighting, step back. Fewer reminders, more fun.
• Take a real break. If after a week or two there's little progress, go back to diapers for three or four weeks without making it a big deal. Then try again.

Is it true girls train earlier than boys? You'll hear that a lot. In our house, it came down to each child's readiness, not whether they were a boy or a girl. Watch your child, not the averages.

Should we start before a new baby arrives? If your child is clearly ready a couple of months before, it can work. If the baby is due soon, many families find it easier to wait until things settle after the birth.

What if daycare wants us to start? Talk with your provider about what your child is showing at home and at daycare. Agree on the same words and routine so your child hears one consistent message.

Do pull-ups slow things down? For daytime training, we found underwear helped our kids notice when they were wet. Pull-ups or diapers for naps and nights were still fine.

Age gives you a window. Your child gives you the date. Watch for a few signs, prepare your home and your schedule, and start when you're both ready. That simple shift saved our family a lot of frustration.

If you'd like a day-by-day plan for the week before and the week of training, The Prep-First Potty Plan lays out exactly what we did, with printables.