Youngest children are often thought of as the lucky ones – the babies of the family who skated through childhood with fewer rules, more freedom and all the attention.

But therapists who work with youngest siblings hear a very different story.

“The youngest child sits in a fascinating and often painful paradox,” Erin Pash, a licensed marriage and family therapist and founder of Pash Co., told HuffPost. “They grew up surrounded by people who loved them and people who consistently underestimated them.”

Although the youngest sibling may face different challenges compared to the forgotten middle child or the “parentified” eldest, their psychological wounds are no less valid. It’s also important to acknowledge the wide range of experiences that youngest siblings can have.

“The research on birth order and its impact on personality and mental health is pretty limited and quite mixed,” said Caitlyn Oscarson, a licensed marriage and family therapist.

“Birth order is only one piece of someone’s story. The family dynamics, relationships and life experiences, along with genetic dispositions, are likely much more important than simply being the youngest.”

Things like culture, parenting style and sibling age gaps can play an important role as well.

“I encourage people to use birth order as a starting point for curiosity rather than a diagnosis,” said Priya Tahim, a licensed professional counsellor and the founder of Kaur Counseling.

“The question isn’t, ’What does it mean to be the youngest?” but rather, “How did being the youngest shape the beliefs I developed about myself, my relationships, and my place in the world?” When we explore those questions in therapy, we often uncover patterns that no longer serve us and that’s where meaningful growth begins.”

There are some general themes that tend to emerge on that journey as well. Below, therapists share the most common issues youngest children bring up in therapy.

“One of the most common themes I see is the struggle to be taken seriously,” said Altheresa Clark, a licensed clinical social worker and founder of Inspire4Purpose. “Many youngest siblings describe growing up being viewed as ‘the baby’ of the family, even well into adulthood. As a result, they often feel their opinions are dismissed or that they have to work harder to prove they are capable, responsible and independent.”

She added that many youngest children feel underestimated, as though their family can only view them through the lens of who they were as a child.

“If your older siblings changed your diapers and wiped away your spit up, it may be hard for them to truly picture you now as a full-fledged adult,” said Natalie Moore, a licensed marriage and family therapist. “Even if you’re competent in professional and personal areas of your life, your older siblings or parents may still treat you as though you’re ‘still figuring it out’ or that you need extra help – even if you don’t.”

Family patterns and roles are well-established by the time the youngest child arrives.

“Youngest children are often the last to be consulted, the last to be believed and the last to have their emotional experiences validated,” Pash said. “That early experience of not mattering as much becomes a deeply internalised belief that follows them into adulthood, their relationships and their workplaces.”

“Growing up in the shadow of older siblings creates a relentless internal measuring stick,” Pash said. “Youngest children often spend enormous psychological energy either trying to differentiate themselves from their siblings or quietly wondering if they’ll ever measure up. Both directions are exhausting. Therapy often uncovers how much of their identity was built in reaction to who came before them, rather than from the inside out.”

From academic and career success to relationships and life milestones, older siblings can set a standard of measurement that makes it difficult to chart your own path.

“Many youngest siblings describe feeling pressure to live up to their older siblings’ accomplishments or, conversely, feeling responsible for ‘doing better’ after an older sibling’s disappointments,” Tahim said. “While these comparisons are often unconscious and rarely come from a place of harm, they can still have a lasting emotional impact. Over time, this can contribute to perfectionism, people-pleasing, self-doubt or a persistent feeling that they have something to prove.”

Furthermore, this dynamic of comparison can minimise the satisfaction and joy of personal achievement.

“There will always be someone who got there first – whether it’s a milestone, a graduation or just age itself,” said Chloë Bean, a licensed marriage and family therapist. “When every milestone has already been reached by someone else, youngest children can struggle to feel a sense of ownership over their own accomplishments.”

“The myth that youngest children are carefree is perhaps the cruelest one because it’s so cheerfully delivered,” Pash said.

“People say it like it’s a gift. What they don’t see is that ‘carefree’ is often the mask that gets assigned when no one is paying close enough attention to the care that’s actually needed. The youngest child learned early that the family’s emotional bandwidth was already stretched, so they adapted. They became easy. They became fun. They made people laugh.”

Underneath that mask, however, there might be a child managing big feelings alone because asking for help felt like too much of an imposition. In this sense, being fun or easygoing is more of a survival strategy than a personality trait.

“Behind the ‘fun one’ label, there can be anxiety, people-pleasing, perfectionism or a fear that if they stop keeping the peace, they’ll disappoint those around them,” Tahim said.

Thus, many youngest siblings opt to “go with the flow” and give off an appearance of “floating through life,” despite the emotional weight they actually carry but don’t necessarily have the skills to identify and communicate.

“The ‘favourite’ label carries its own particular sting,” Pash said. “Many youngest children tell me they felt simultaneously favoured and overlooked, given treats and flexibility while being denied depth and seriousness. Being the favourite doesn’t mean being the most important. It often just means being the most manageable.”

The youngest sibling might experience less strict versions of their parents and have fewer responsibilities, but that comes at a cost.

“The idea that the youngest sibling is always spoiled or the favourite is often much more complicated than people realise,” Clark said. “Many of my clients describe feeling overlooked rather than overindulged. Others explain that while they may have had certain freedoms growing up, those freedoms also came with assumptions that they didn’t need as much guidance or emotional support because their parents were more experienced by that point.”

And don’t forget the burden of an older sibling’s jealousy or resentment – which can create additional pressure to prove your worth and chip away at self-confidence.

“Maybe the older sibling envied the youngest’s freedom, slack and less rules,” Bean said. “The younger sibling grew up resented simply for existing and splitting the parents’ attention. This is common because the youngest sibling had no say in the family structure they were born into, but they absorb the blame for it. Children internalise that kind of resentment as ‘something is wrong with me’ way before they understand where it actually comes from.”

“Because older siblings or parents may have been accustomed to looking after them, youngest siblings sometimes struggle to separate their own identity from family expectations,” Clark said. “This can show up in people-pleasing, avoiding conflict or feeling guilty when making decisions that differ from what their family wants.”

As they get older, youngest children may struggle with taking up space, expressing needs and setting (and enforcing) boundaries.

“Learning that their needs are legitimate – not an inconvenience – is frequently the central work,” Pash said. “The family peacekeeper often becomes an adult who struggles to say no.”

They might feel particularly deferential to older siblings who took on a caretaking role in their childhood.

“You may find that when discussing personal stressors or decisions, that they jump in with advice or opinions even if you didn’t ask for them,” Moore said. “This can cause friction between siblings, where it’s more appropriate to have a peer-to-peer relationship, versus one with a parental-style hierarchy.”

“Some youngest often feel they don’t have the power to say no or the safety to express anger as a kid, so they develop conflict-avoidant behaviours such as passive aggression as adult,” she explained. “Some behaviours include saying yes but not doing the thing, backhanded comments or sarcasm. In those situations, the work is around building tolerance for discomfort, expressing ‘no’ or anger in a meaningful way and discerning the humor and anger in sarcasm.”

“When older siblings, parents and even extended family consistently swoop in to solve your problems, tie your shoes and finish your sentences, you don’t develop the same tolerance for discomfort and struggle that builds confidence,” Pash said.

“Many youngest children arrive in adulthood with a quiet but persistent belief that they can’t fully trust themselves because they were rarely given the chance to find out.”

It’s a kind of learned helplessness that leads to adults who second-guess themselves, defer to others, struggle with confidence in their own judgment and feel extreme anxiety around being wrong.

“When you’re the youngest sibling, your older siblings are likely to be more developmentally advanced in almost every area,” Moore said. “As an adult, this seems obvious – of course an 8-year-old is better at jump rope than a 5-year-old. But young children don’t necessarily understand that it’s not that their older sibling is ‘better’ at everything than them inherently, it’s just that they’ve had more time to develop their skills and talents.”

As a result, they may feel chronically behind and incapable.

“Because early childhood experiences shape our adult lives to a great degree, a youngest sibling could maintain this ‘trying to catch up’ internal blueprint long after it’s no longer relevant,” Moore added.

While youngest children are often assumed to be the centre of attention, many carry a quieter wound – a feeling of having been overlooked in ways that are hard to articulate.

“By the time they were born, their parents had already raised the older kids, so the youngest one tends to receive less attention, fewer photos, fewer ‘first-times’ that anyone made a fuss over,” Bean said.

“Youngest siblings can also feel left behind, like the caboose of the whole train. The rest of the family shares memories the youngest was never part of, and that shared history is something they can never catch up to. If the household was chaotic as they were growing up, or if the parents were spread thin, the youngest one learned to regulate by staying small, agreeable and low-maintenance.”

Yiu explained that youngest children may feel less important or like they were given the most tired and least structured version of their parents.

“Novelty fades with each child, which shows up as less documentation, not less love,” she noted. “Reframing this as a lack of novelty rather than a lack of importance tends to take the sting out of it. Knowing this intellectually doesn’t always undo the feeling, and part of the work is sitting with the fact that something can be true and still hurt.”

Pash described a related paradox of “invisibility within visibility.”

“The youngest child often walks into therapy half-convinced they don’t have a real reason to be there,” she said. “They weren’t abused, they weren’t neglected in the obvious ways, and someone always thought they were delightful. But delight is not the same as being known. Warmth is not the same as being witnessed and genuinely understood.”

“At the core, most youngest children are working toward the same thing – being taken seriously by others, and eventually by themselves,” Pash said. “More specifically, this often looks like developing a self that belongs to them. So much of the youngest child’s identity was shaped by reaction – to older siblings, to parents’ exhaustion and distraction, to family narratives already in motion before they could speak.”

This leaves the youngest siblings wondering who they really are when they aren’t performing the role they were born into.

“They might want to develop a stronger sense of identity, be taken more seriously and taking themselves more seriously, maybe limiting unsolicited advice from other family members and changing the baby role dynamic with their parents and siblings,” said licensed clinical marriage and family therapist Robin Hamilton.

Learning self-reliance and understanding their own personal values are key goals as well.

“Some younger siblings may struggle with trusting their intuition because they grew up hearing, ‘You don’t really understand’ or ‘You’re too young to know what’s going on,’” Oscarson said.

With time and effort, however, youngest children can cultivate that stronger sense of self and instinct.

“They can work on increasing confidence in their own decisions, communicating boundaries more effectively, trusting their voice and recognising that they do not need external validation to prove their competence,” Clark said. “Many are learning to embrace adulthood without feeling like they have to continually convince others that they are capable.”