Will Daycare Turn Your Kid into an Aggressive Little Monster?

Fellow parents, you are not alone.

Researchers discovered that while the child’s response to the parent leaving was important, far more revealing was how the child reacted when reunited with the parent. Children who were more securely attached to their parents, Ainsworth concluded, tended to protest when their parent left the room but were more easily comforted when the parent returned than were children with a less secure emotional attachment. The reasoning seemed simple: The child with a stronger attachment knows he or she can trust the parent and, in turn, that everything will be okay.

For decades, developmental psychologists believed that the most well-adjusted kids were the ones who didn’t cry or act out when the parent left. Later, in the early 1990s, when researchers began assessing children’s heart rates and cortisol levels—both indicators of stress—they found that these children were actually the most affected; they just weren’t displaying any outward signs of distress.

In other words, it’s the quiet ones we have to watch. Sometimes they’re the ones who need the most attention.


When Otis first started lashing out at his baby brother, I picked up the phone and reached out for help. I’m an English professor, and during my creative writing workshops I often talk about the power of narrative, how writing about our lives and finding form in seemingly random, sometimes chaotic events can offer us some relief and understanding. It felt natural to connect with other writer-parents to hear what they had to say. First on my list was Laura Markham, author of Peaceful Parent, Happy Siblings: How to Stop the Fighting and Raise Friends for Life. I’d suspected sibling jealousy might play a part in Otis’s outbursts, but what Markham said surprised me: “Your son’s experiencing the perfect storm. A new baby in the house and he just started daycare? Those are both huge stressors.”

From the outside, Otis didn’t look stressed. In fact, he seemed to be adjusting well to being at daycare—but how I think he’s adjusting may be different from how he’s feeling and from what he’s experiencing inside. He doesn’t cry when we drop him off. His teachers tell us how much he’s enjoying school. And he’s not “acting out” until he gets home. If Otis falls down at daycare and looks around and no one is there to comfort him, he may brush himself off and continue on with his day—and if we were to see this, we might describe it positively: He’s independent. He’s handling himself well. But his stress levels might have skyrocketed and he may be struggling to process this moment. This struggle might continue throughout the day, compounded by other experiences when he feels alone or unsupported, so when he finally gets home and he’s in a place where he feels safe enough to express himself, he might turn to Tucker and give him a good, hard smack.

On my quest for advice, I also reached out to Rebecca Putnam, an expert in early childhood education and the director of the Children’s Center at Regis College, in Weston. “If it’s the first time the child is in childcare,” she says, “it’s all about figuring out the makeup or the structure of the child’s new routine. Because 99.9 percent of all aggression is not hostile, it’s instrumental. It’s the child trying to let us know something.” As a two-year-old, Otis hasn’t yet developed the ability to reason or understand his aggressive impulses. Combine this with the transition from staying home with Mom and Dad to attending daycare—and that his parents suddenly invited a little gargoyle named Tucker to live with him—and it makes sense that he might be a little pissed off.

But what about the month leading up to daycare, I asked my wife one sleepless night, back when Otis was home with Tucker and me and there was no hitting, no aggression? Daycare must be the reason, right?

Yes and no—which I’m quickly learning is the answer to all of my parenting questions. The correlation between daycare and child aggression turns out to be less significant than many families once believed. Children often display increased aggressive behavior after transitioning to daycare, according to a recent study of Norwegian families conducted by Eric Dearing, a professor in the Department of Counseling, Developmental and Educational Psychology at Boston College, but whether or not this behavior has long-term effects greatly depends on the quality of the care the child had at home prior to daycare. “If you can possibly wait until the child is a year old before starting daycare, I think it makes a huge difference,” Markham says. “Because after that time, they have a secure working model of relationships.”

Fortunately for parents and children, any negative effects from daycare—increased aggression, hyperactivity, or other behavioral problems—are believed to diminish over time. Part of Dearing’s work with Norwegian families included comparing children from the same family who spent varying amounts of time in daycare. “Over time,” his study suggests, “the association between daycare and aggression starts to go away or become very weak, almost negligible. Based on studies in the U.S. and around the world, the evidence doesn’t seem convincing that daycare is the causal factor for aggression.”

To put a finer point on it, daycare hasn’t been proven to cause kids to become violent, and in some cases it can even be a real boon. For instance, children in families whose socioeconomic status or family dynamic has suddenly changed—a parent loses a job or the parents divorce—are less likely to show aggression, anxiety, or depression when receiving high-quality daycare.

Great. But what about Tucker’s face?

When Otis goes after his baby brother, my natural impulse is to yank him away or step into the line of fire. Tucker, I’d take a Matchbox car for ya, or even a toy train. But as I’ve realized, and I believe many parents also realize, instincts carry consequences. Of course my priority is to keep the kids safe, but by stepping in, I may be missing a so-called teachable moment. “Often, how the parent responds to the child’s ‘aggression’ sets the child up for success or failure,” I remember Putnam telling me. “So we try to teach the parent how to respond.”

As an example, she tells me a quick story about a pair of twins from one of her classes. Every day when their mother would come to pick them up, they would kick and scream. Putnam’s ingeniously simple solution—talk it out. When the mother asked the twins what they needed, they told her: “We want to hold your hand, Mom!” Once the mother knew that, they were fine. “Words solve problems,” Putnam says.

What if Otis doesn’t feel like talking? “Make sure you’re spending one-on-one time with him,” Markham advises me. “And that he gets a chance to let out all of those feelings he’s been stuffing down throughout the day. When he comes home, he has a backpack full of emotions, many of which are rooted in fear and anxiety. But if you can make him laugh, if you can help him process those emotions in a positive way, you can preempt an aggressive outburst.”

I decide to give this a try (because it’s either that, or I’m going to have to buy Tucker some sparring gear). Several days later, Otis and I stop at a park outside Union Square, the one with the big slide overlooking Somerville Avenue full of garbage trucks and street sweepers and construction equipment. Tucker is strapped to my chest, sleeping, his mouth open. Otis stands at the bottom of the slide, staring at us.

“Da-da. Come play,” he says, steam coming from his ears in frustration that I can’t climb the slide with Tucker tied to me. He turns away, the face on his overstuffed monkey backpack staring straight at me. As he begins to climb, I undo the straps on the baby carrier and lay Tucker down inside his stroller.

Before Otis can turn around, I’m right behind him, chasing him up the slide. He laughs and laughs, and when he finally gets to the top and slides down, landing in front of his younger brother, he’s laughing so much he can hardly say a word. Let alone throw another punch.


Anthony D’Aries is a father of two, an English professor, and author of The Language of Men: A Memoir.