The Scoop on Poop: What's Normal, What's Not

BMs: A Timeline

Poop will evolve dramatically as your baby ages and expands his diet.

In utero Bet you didn't know that stool was forming in your baby's intestines far before birth. It's full of meconium, a sterile, sticky, brownish-green substance made up of swallowed amniotic fluid, hair, bile, and body cells. Most babies wait until birth to pass meconium.

1 to 4 months When your baby is 3 or 4 days old, his stool changes from tarry meconium to a watery consistency. Babies usually make up to ten dirty diapers a day for the first one or two months and then go two to four times a day until around 4 months. This is thanks to the gastrocolic reflex, which occurs as the stomach stretches with food and the colon is automatically signaled to empty and make room for more. In babies, the gastrocolic reflex is immature, so each time they feed they usually squirt out a little poop. Over time, some babies' intestines absorb so much breast milk that they create extremely small amounts of waste and their colon doesn't empty more than once daily, or even once weekly in some cases. Formula-fed babies typically poop less frequently than breast-milk eaters because their stool moves through the intestines more slowly. They go about once or twice a day, every one or two days, after the first one or two months -- but some poop up to three or four times daily at first. Meanwhile, babies on both formula and breast milk go somewhere between multiple times a day and once a week.

5 to 12 months Once a baby starts eating pureed foods and cereals, between 4 and 6 months, her stool will change. A breastfed baby's poop often thickens with the addition of solids, whereas a formula-fed baby's usually softens. If your breastfed baby used to go only every five days or so, you'll see it becomes more of a daily event.

1 to 3 years As you transition from breast milk or formula to whole milk and a more solid diet, the stool will continue to change. For most babies, it gets thicker and harder. Between 12 and 18 months, you'll probably also notice what I call the "salad diaper," filled with larger pieces of veggies that are more difficult to digest. This can make your effort to offer a diverse range of foods feel like a huge waste of time! But it's not, insists Evelyn Hsu, M.D., a gastroenterologist at Children's Hospital of Seattle. "Your toddler's colon is just learning how to process whole veggies," Dr. Hsu explains. (Not to mention that kids aren't necessarily chewing well at this stage.) Over time you'll see the food get more digested.

Research shows that the perfect time to begin potty training is between 27 and 32 months of age. When we talk about potty training, though, we usually mean learning to pee. Pooping in the potty often comes later; most kids are able to do it by 3 or 4 years of age.

3 to 5 years By now, kids ideally poop once a day. And when they do, it should be soft and pain-free. However, constipation is common around this age. I often ask older children if their stool looks like a bowl of chunky soup, a snake, a log, or a bunch of pebbles. The answer I'm looking for: a long snake.

Kids who are constipated often have trouble toilet training because they'll avoid pooping if they're afraid it will hurt. To treat constipation, I suggest that 50 percent of a child's calories come from fresh fruit and veggies and that she should have no more than 2 or 3 cups of milk per day. Parents should also have their child try to sit on the potty after every meal. If those methods don't work, we prescribe stool softeners such as Miralax. Have patience and stay positive! With that, I wish you well in the diaper years. We all want an end to the potty patrol, but the exact timing is ultimately up to your child. Do your best to provide support for your child. And then know this: Although pooping on the potty may seem like the finish line, many of us can be found wiping bottoms for a few more years to come.

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