Growing up · 2026-10-28
The Special Space in Your Arms
Older siblings may act out when a new baby arrives to test their secure base. Just ten minutes of one-on-one time daily can restore their sense of safety.
The arrival of a new baby brings joy to a family, but often a subtle tension, too. When a parent is feeding or soothing the newborn, a three- or five-year-old might suddenly rush over, demanding to sit in the exact same spot, or throwing a sudden tantrum. In moments of exhaustion, this can feel like defiance. But if we crouch down and view it through the older child's eyes, it is actually a profound question about love: "Is there still room for me in your arms?"
Testing the Secure Base
In developmental psychology and attachment theory, parents serve as a "secure base" from which a child explores the world. The classic research of psychologists John Bowlby and Mary Ainsworth shows that when children feel stressed or experience a major environmental shift, they instinctively return to their secure base for reassurance.
The arrival of a younger sibling is often the first major social upheaval in a young child's life. The "base" that once belonged entirely to them is suddenly occupied by a crying, demanding newborn. As a result, older siblings often show signs of regression—suddenly asking for a bottle, using baby talk, or demanding to be carried everywhere. They haven't forgotten how to be independent; they are simply using their most primal tools to test a hypothesis: Am I still loved? Am I still safe?
The Heavy Cloak of the Big Sibling
We often unintentionally tell older children, "You're the big brother or sister now, you have to be sensible." However, from a neurological perspective, children between the ages of three and eight are still developing their "Theory of Mind"—the ability to understand that others have different needs and perspectives. It is incredibly difficult for their developing prefrontal cortex to grasp why a newborn requires such constant, overwhelming care.
They are full of curiosity and confusion about this new arrival. Just as they might ask their AI learning companion, Sparkie, "Why does the baby sleep all day?", they are trying to make sense of this strange new roommate. It is crucial to allow them to express mixed feelings. We can validate that it is entirely normal to love the new baby, whilst simultaneously finding them quite annoying.
Ten Minutes of Exclusive Time
The American Academy of Pediatrics (AAP) highlights that during the transition to siblinghood, what older children need most is undivided attention. This doesn't mean parents need to magically split their time perfectly in half; rather, it is about providing high-quality, one-on-one connection.
Even just ten minutes a day can work wonders. Put the phone away, let another caregiver tend to the baby, and be fully present with the older child. Let them lead the play during this time—no teaching, no correcting. This brief but intense burst of connection can quickly fill their emotional bucket, significantly reducing feelings of rivalry and anxiety.
Things to try at home this week
- Name the special time: Set aside ten to fifteen minutes a day and name it after your older child, such as "Leo's Time". Let them be the sole director of what you play together during these minutes.
- Let them be a baby again: If they ask to be rocked or held like a newborn, warmly indulge them. You can add a touch of humor: "Wow, I have such a big, heavy baby today!" This satisfies their craving for nurturing without making them feel ashamed for wanting it.
- Be on their team: When you have to interrupt playtime to care for the newborn, try framing the baby's needs as a shared minor inconvenience. "Oh dear, the baby needs another nappy change. Let's get this done quickly so we can finish building our amazing tower."