A young child snuggled against a parent in the soft evening light, their lovey held tight.
Big family transitions

Your older child's regression after the birth: why they "act like a baby"

By the Tilibou team · Last updated: June 2026 · 6 min read

Your older child, dry for months, starts wetting the bed again. They ask for a pacifier, talk in baby talk, want you present to fall asleep. This is what's called a regression. This step back is considered normal in a child's development: they simply need time to adjust to the baby's arrival.

Why is my child regressing after the baby's arrival?

Because their life has just been turned upside down, quite simply. A new baby is one of the biggest jolts a little one can experience. It's explained plainly: any event or situation that asks a child to adapt can lead to a regression, and the arrival of another baby is one of those, just like starting school or a move.

What's at play is subtle. To face the unknown, the child returns to what they already master. Going back to a known and mastered stage of development is a way for them to feel safe, to reassure themselves. Acting like a baby is their way of taking back control of a situation they can't control. It's neither a tantrum nor a worrying step back. It's a child's strategy.

Is it normal, and how long does it last?

Yes, it's normal. The point is clear: even though not all children regress during a major change, this step back is considered normal in a child's development. You haven't missed anything, your child isn't doing badly.

As for duration, don't expect a straight line. The regression generally lasts a few weeks and can vary from day to day. One day they act like a big kid, the next they ask for the bottle, the day after they become independent again. This zigzag is entirely usual. It's described precisely: a child may adopt a regressive behavior for a day, return to a more mature behavior the next day, and go back to regressive behavior the following day.

How do you respond without overdoing it?

The most useful instinct is to welcome, not correct. The advice is to accept regressions while your child adjusts to a new or stressful situation. Here are a few concrete markers, drawn from the recommendations:

  1. If they want you present to fall asleep, stay near them for a short while. Evening is often the peak of requests.
  2. Give them positive attention. If they don't wet the bed, encourage them, without dramatizing the times it happens.
  3. Avoid reproaches. They don't help and mostly risk putting the child on the defensive.
  4. Be wary of the phrase "you're the big one now." It's better not to over-emphasize this new status.
  5. Name what they feel. Put words to their worry and reassure them about your love and your availability.

There's even a ready-made phrasing to adapt: "You're asking me to rock you and give you your lovey. That reassures and comforts you. You're worried because we now have to take care of your little sister, but we'll always be there for you." Nothing to add.

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A tender story about comfort and everyone's place, perfect for an older child who needs to hear again that they matter. You give the cuddle, Tilibou takes care of the voice.

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Bedtime is getting complicated: what do you do?

This is often where the regression shows most. The child who used to fall asleep alone asks for a parent again, wakes up, resists the lights going out. The good news is that the evening ritual is precisely the tool that reassures in those moments. A stable, predictable frame, evening after evening, gives the child their bearings back when everything else around them has changed.

Stay near them for as long as needed, without dragging it out indefinitely. An older child who starts asking for a parent's presence to fall asleep again, once or twice a week, for several weeks, isn't a cause for concern. A gentle story, a calm voice, a cuddle: these are the ingredients that soothe a big brother or big sister shaken by the newness.

When should you talk to a professional?

Most of the time, the regression passes on its own. But some signals are worth pausing on. It's recommended to consult a professional if the regressive behaviors harm their learning and overall development, or if the child regresses across several areas for several weeks. A child who, every day, asks for the bottle again, wets the bed, and is afraid of the dark all at once deserves a closer look at the causes.

One useful point: if a child who has been dry for a long time suddenly starts often wetting their underwear, this regression could be caused by a urinary tract infection. When in doubt, a medical opinion lifts the worry.

Questions you might be asking

My 5-year-old is regressing even though they're big, is that worrying?

Not in itself. A child can regress regardless of age, and it isn't abnormal to see some regression in a child aged 5 or older. In older children, it's often more subtle: picking up a set-aside lovey, for example. What matters is the duration and the impact on their daily life.

Should I give the pacifier or bottle back if they ask for it?

Not necessarily. It's better to offer comfort another way rather than reverse everything. Instead of giving a pacifier back, you can rock them. The idea is to answer the need for safety hiding behind the request, without necessarily reinstating the object itself.

Can regression appear even if I prepared my older child well?

Yes. Even a child who is well prepared and happy about the baby's arrival can see their behavior change for a few weeks. They need time to get used to their new role and to make sure they keep a special place with you.

Good to know. This article is informative and does not replace the advice of a health professional. If your older child's regression drags on for several weeks, touches several areas of their development, or comes with marked distress, talk to your doctor or your pediatrician.
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Written by the Tilibou team. We make bedtime stories for ages 3-7, and we read a lot to stay accurate. Our articles cite trusted sources; they don't replace a health professional.
Sources. This article draws on guidance from recognized child-health authorities and the World Health Organization (link). It is informative and does not replace professional medical advice.