The older child who was thrilled about the new baby during pregnancy and then became clingy, demanding, or intermittently unkind to the infant once it arrived is not being irrational. They are responding exactly as expected to a major change in their world that they had no real way to prepare for.
Most of the advice given to parents before the birth focuses on preparation: involving the older child, reading books about new babies, setting up special roles. All of these are fine. What is less often addressed is how to manage the aftermath when the preparation has not produced the serene sibling relationship the books implied.
Healthbooq (healthbooq.com) covers family life and parenting through the early years, including the transitions that affect the whole family.
Why It Is Hard for the Older Child
Before the baby arrived, the older child was the centre of the family's attention, not in a spoiled sense, but in the normal sense that a child who is the only child receives. Their needs were responded to first, their schedule was the primary one, their relationship with each parent was exclusive.
The new baby changes all of this simultaneously. The parents are exhausted, less available, distracted by a tiny and demanding being who gets a great deal of physical contact. The older child's needs are being met but more slowly, with less presence, and sometimes with parental frustration they cannot fully conceal.
The older child, depending on age, may not have the language or cognitive tools to process this as "my parents are adjusting to having two children." What they experience is often felt as a loss: something was here and now it is different.
Regression
Regression is one of the most common and confusing responses. A child who was dry at night begins wetting again. A child who had given up a dummy asks for one. A child who was speaking clearly begins to speak in a baby voice. A child who was sleeping independently starts asking to sleep in the parents' bed.
These are not deliberate attempts to compete with the baby, though they can look that way. They are expressions of a stress response: when the environment becomes uncertain, children sometimes return to behaviours that were associated with a period of greater security.
The effective response is to meet the regression with warmth rather than frustration. Denying the dummy or the co-sleeping, particularly in the early weeks when everything else has also changed, adds to the sense of insecurity. The behaviour is a communication that the child needs more reassurance, and responding to the underlying need tends to reduce the behaviour more quickly than refusing it.
Ambivalence About the Baby
The older child who says "I don't like the baby" or "can we send it back" is expressing ambivalence that is perfectly understandable and should not be suppressed. Parents who respond with "of course you like the baby" or "that's not a nice thing to say" communicate that the honest feeling is not acceptable, which pushes it underground rather than resolving it.
A more useful response acknowledges the feeling: "You feel like the baby is getting a lot of attention. That makes sense. It's okay to feel that way." This validates the experience without validating any behaviour that follows from it (hitting the baby is still not acceptable).
Expecting the older child to perform delight about the baby is unrealistic and counterproductive. An older child who is not yet feeling warmth toward the baby is not failing morally; they are having a normal adjustment response.
What Helps
One-to-one time with each parent, however brief, is the most consistently reported protective factor for older children after a new baby. Even 20 minutes of undivided, screen-free attention, doing something the older child chooses, communicates that they still matter and their relationship with the parent is intact. During this time, the baby should ideally be absent or asleep.
Predictable routines help. The older child's core schedule (nursery, bedtime, meals) should change as little as possible. Where changes are necessary, explaining them in advance reduces the sense that things are arbitrarily shifting.
Involving the older child in age-appropriate baby care, fetching a nappy, choosing an outfit, singing to the baby, can create positive shared experience rather than a competitive dynamic. But this should not be forced or required.
Acknowledging that the older child is also going through something, rather than only framing the new baby as an addition to the family, helps the child feel seen.
The longer arc: most sibling jealousy peaks in the first three to six months and then diminishes significantly. Children who struggled in the early weeks often develop genuine warmth toward a sibling by the time the baby becomes interactive and fun.
Key Takeaways
The arrival of a new baby is a significant change for an older child, who has to adjust to reduced parental attention at a time when they lack the cognitive tools to fully understand why. Regression (returning to earlier behaviours such as bedwetting, thumb-sucking, or baby talk) is a very common response and should be handled with warmth rather than frustration. Jealousy and ambivalence about the baby are normal and should be acknowledged rather than suppressed. What helps most is predictable one-to-one time with each parent, acknowledging the older child's experience without dismissing it, and avoiding asking the older child to perform positivity about the baby.
