When it happens · 5 min read
The new baby arrived, and your older child has fallen apart
You were braced for jealousy. What usually arrives instead is a child who has gone backwards on everything they'd mastered, won't let you hold the baby, and has become someone you don't quite recognise.
Almost none of that is about the baby. It's about a two-year-old with no way to say that the terms of their life changed without their agreement.
Last updated August 3, 2026
Expect the regression, don't treat it
Sleep, speech, the potty, the bottle — going backwards on any of these when a sibling arrives is so common it's closer to the rule than the exception. It is not lost ground and it is usually not worth a campaign to recover.
Pushing back on it tends to extend it, because the regression is a request for reassurance and refusing it makes the request more urgent. Nappies for a fortnight is a shorter road than a potty battle stacked on top of a new baby.
Set the expectation for yourself, too. A month of this is ordinary. The version where the older child is delighted from day one exists, and it is not the common case.
A real job, not a symbolic one
"Big brother" as a title does very little. A specific, actual task does a lot: fetching a nappy, choosing the outfit, holding the burp cloth. The distinction is whether the job would still need doing if they weren't doing it.
Protect a small amount of guaranteed one-to-one time and be boringly reliable about it. Ten minutes that always happen beats an afternoon that gets cancelled — predictability is the active ingredient, not duration.
Preparation before the birth works best as exposure rather than explanation at this age. A one- to two-year-old doesn't really understand what's coming; seeing babies, holding a doll, visiting someone with a newborn does more than a book about feelings.
The safety risk nobody watches for
Everyone watches for hitting. The genuinely dangerous version is helping — a two-year-old who wants to give the baby a snack, share a drink, or lift them out of the cot to be kind. Supervision matters more around affection than around aggression.
Watch the floor once the baby is mobile. The older child's small-parts toys are the single biggest new choking risk in the house, and they arrive precisely when your attention is most divided.
On the hitting itself: go to the child who got hurt first and give them the attention. Be short, calm and boring with the one who hit. Attention is the currency, and the ordinary instinct — turning immediately to the aggressor — pays it in the wrong direction.
Common questions
- How long does this last?
- Most of the acute phase settles over a few weeks to a couple of months. Sleep is usually the last thing to come back. Escalation rather than gradual settling is the signal worth asking about.
- Should I stop the older child touching the baby?
- No — supervised contact is how the relationship gets built. What needs a hard rule is unsupervised contact, especially lifting, feeding or covering.
- They've started hitting me instead of the baby. Is that worse?
- It's common and it's arguably the safer version. It's still worth the same calm, brief response — and it usually fades as language catches up with the feeling.
Written from the same sources we cite everywhere else, and it is not a substitute for your own doctor. If something feels wrong to you, that instinct is a good enough reason to call — you know this child better than any page does.