Attachment & Co-Regulation · 18 months to 5 years

Expect Mixed Feelings About the New Baby

A new sibling is a big change, not a crisis. Children react very differently, and a pull away from you for a while is the most common shift.

The moment

The baby is three weeks old. Your three-year-old, dry for months, has wet their pants twice today, and while you're feeding the baby they say, 'Put her back. I don't like her.'

What to say

Four ways to say it. Research doesn't rank these against each other, so pick the one that sounds like you.

Emotion Coaching · Accept the feeling without fixing it

"You don't like her right now. It's really different with a baby here, and I'm busy a lot. I get it. Come and sit by me."

The feeling is allowed, and so is the baby.

Montessori / Respectful · Give them a real part in the care

"I'm nearly done feeding her. Could you bring me a clean diaper from the basket? … That's the one. Thank you."

A true job gives them a place in the new arrangement.

Connection First · Promise a specific time that's theirs

"She's staying, sweetheart. And you and I are still us. When she's down for her nap, it's just you and me. You choose the game."

Firm on the fact, generous with belonging.

Choices & Logic · Stay matter-of-fact about the accident

"Wet pants. That happens. Dry ones are in your drawer. Yell if you want a hand."

No shame and no drama, and the fixing stays with them.

What's going on

Your older child has lost a share of your time and doesn't have the words for it. Acting younger, clinging or saying harsh things about the baby are ways of asking where they stand.

What it looks like day to day

Accidents, baby talk, 'carry me', rough 'hugs' for the baby, or no visible reaction at all for weeks.

What the research supports

A review of 30 studies of firstborns around a sibling's birth found no support for the idea that it's a crisis for most children. Affection and responsiveness toward the mother tended to dip; findings on sleep, anxiety, aggression and regression were mixed; and children varied widely, from upset, to no noticeable change, to a jump in maturity (Volling 2012).

Where it's your call

Whether you set up regular one-on-one time, give them a helper job or just keep their routines steady is your call; the review doesn't rank them. The baby's physical safety isn't a style choice: stay within reach when they're together.

Sources

Each one links to the paper. How we check them is on the sources page.

Volling BL (2012) · Psychological Bulletin
Studies of firstborns around a sibling's birth did not support the idea that it is a crisis for most children. Affection and responsiveness toward the mother tended to drop; findings on sleep, anxiety, aggression and regression were mixed, and children differed widely, from disruption to no visible change to new maturity.
Review of 30 studies · 30 studies of firstborn children around a sibling's birth
PubMed(opens in a new tab)

Hard moments land differently depending on how you were raised.

In the app, this guide comes with a short note for the pattern you'd like to leave behind, such as calm over anger, emotion validation, direct repair over silence and 9 more, and a new guide matched to your child's exact week. Free, no account, and nothing leaves your phone.

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This guide is parenting education, not medical advice. The scripts are examples to adapt, not tested treatments. If you're worried about your child's health or development, talk to your pediatrician.