15-Month-Old Baby: Milestones & Development

Team PeanutTeam Peanutabout 1 year ago6 min read

In the world of a 15-month-old baby, everything is interesting. And they’re not satisfied with window shopping. Looking has to be accompanied by touching and tasting—just to be sure that said item is indeed as fascinating as it appears. No 15-month-old baby can be too certain.

15-month-old baby

And not only are they down with the detective work, those tantrumy twos are on the horizon, and they’re starting to rehearse for their starring role.

But it’s not all detectives and divas. This period is filled with all sorts of wonders (and challenges) as you get to know your baby better and better every day.

So what are the milestones for a 15-month-old? Let’s take a look at what you might expect.

15-month milestones

Babies are all magnificently different. Factors such as being born premature, for example, affect the speed of a baby’s development.

So rather than thinking of this as some sort of 15-month-old development checklist, see it as the roughest of guidelines.

(Read: don’t freak out if you think your baby is behind in some way—but do check in with your doc if you’re at all worried.)

15-month development

What should my 15-month-old be doing?

While there are no shoulds here, these are some things you might expect:

  • Responding to their name! You know—the one that you spent so much time agonizing over? They’ve decided to show their appreciation for all your hard work.
  • Finding their feet. They’ll likely be doing some sort of dance that looks an awful lot like walking a few steps.
  • Showing some love. Baby kisses and cuddles are the best compensation for sleep deprivation, we promise.
  • Imitating. Of course, the sincerest form of flattery. They may be copying everything from animal sounds to actions you make.
  • Developing a personality. They’re becoming more and more themselves every single day. That little personality is emerging, and getting to know them is oodles of fun.
  • Baring their teeth. Teething may be upon you. There might be a molar making its way to the surface.
  • Rehearsing their stand-up routine. They might have worked out that certain things they do make you laugh. They will do said things again. Because they just love that limelight. And this isn’t only with laughter. They’re starting to understand that their actions cause reactions in you.
  • Honing their preferences. In preparation for hitting that “Like” button one day, they’re starting to get a handle on their preferences—and bath and bedtime might not be so high on the priority list when there’s a whole world to play in.
  • Freeing their feet. They’re realizing the wonders of going sockless, and may be trying to do so at every available opportunity.
  • Engaging in miscreant madness. Did they really just push their little friend? If their behavior seems somewhat tyrannical, you may be comforted to know that this is quite normal at this age. They can’t differentiate between their pals and their playthings, so, at least for now, “boisterous” behavior is to be expected. It might be a good idea to plan some Peanut mama meetups, so that they can start practicing how to interact with other tiny humans.

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How many words should my 15-month-old say?

Here’s the average number: 2 to 5. But seriously. This is only an average.

There are outliers on either side of the spectrum. If you’re at all worried, check in with your doc.

Some favorite words? Mama, Dada, Baba, Nana, Doggie. It can be more than a little enchanting watching your baby discover their language.

They might also have a whole repertoire of gibberish syllables that they like to string together into something that sounds a lot like a news broadcast. Or a fairytale. Or a ghost story.

And not all language is verbal. They may be mastering the art of the point, both as a means of identifying body parts (Where’s your nose?) and as a means of ordering you around to get what they want.

As you may have experienced, they might be more than a little upset if they don’t get the items they’re after.

While this can be incredibly challenging, it’s normal. They’re learning (rather dramatically) how to get what they want in life. (Mine! Mine! Mine!)

Oh, a quick heads up: rather than asking, What words should baby say at 15 months? ask what words they shouldn’t be saying.

Remember how good they’re getting at playing copycat? (C’mon. What mama hasn’t dropped an expletive while an item nosedives to the floor during a magical display of multitasking?)

15-month-old baby weight

How much should a 15-month-old weigh? Somewhere between 21.2 and 22.7 pounds, according to the WHO.

That’s about double the weight of a small cat. No wonder your arms are tired.

Height-wise, they’re likely between 30 and 32 inches tall.

15-month-old baby food

Your 15-month-old baby is likely on a similar eating schedule to you: three meals and two snacks a day, all amounting to about 1000 calories.

Pick from all food types and colors: fruit, vegetables, grains, meat or vegetarian proteins, and yogurt.

Major bonus: they can pick up finger food and put it in their mouth. What a hit they would make at a cocktail party.

15-month-old sleep regression

They may be getting better at eating. Sleeping? Perhaps not as much.

Sleep regression usually lasts about 2 to 4 weeks and coincides with big milestones (such as learning to walk) and growth spurts.

While not too typical at exactly 15 months, there’s a chance that your baby could experience sleep regression at this juncture.

Sleep regression is essentially baby nightmares—and, at this young age, they can’t tell the difference between nightmares and reality. Frightening, for sure.

This might cause your little one to wake up multiple times or be fussier at bedtime, and can even cause changes in appetite.

What can you do to make sleep issues all a little easier for them?

Regular sleep schedules and a bedtime routine do wonders, but are not always possible. Do what you can.

It’s also a good idea to spend a bit of extra time settling them before bedtime.

Go into wind-down mode a while before sleep-time by cutting out the more stimulating activities. Then, of course, hop into full mama reassurance mode if they have a meltdown.

You and your 15-month-old baby

You might be all sorts of exhausted right now. Sleep challenges may be leaving you spent.

The other thing that we don’t talk about nearly enough is how isolating having a 15-month-old baby can be.

Whether you’re at home or back at work, the experience can be pretty solitary.

So, while it’s easier said than done, this is as good a time as any to reach out to your support network. The mamas of Peanut will always have your back.

🤰 Read next: 16-Month-Old Baby: Milestones & Development

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