Sibling Rivalry: When Brothers and Sisters Fight, and When a New Baby Arrives

Two kids, one toy truck, and a scream from the living room. By the time you get there, both are crying and both say the other started it. Ten minutes later, they’re playing together like nothing happened. Then it starts again.

Sibling fights are tiring, but they are also where children practice sharing, waiting, losing and making up. Your job is not to stop every fight. It’s to keep everyone safe and help them get better at ending them.

In one minute

• Fights between siblings are normal and common, especially between ages 2 and 8. Toddlers grab, preschoolers shout “not fair”, older kids argue and bargain.
• Most fights are really about attention and fairness: who gets you, who gets more, who goes first.
• Be a coach, not a referee. Keep everyone safe, then help them find their own solution.

What’s going on

Every child wants to feel special to their parents. A sibling is living proof that they have to share you. When a new baby arrives, an older child may suddenly act younger: wanting a bottle, talking in a baby voice, having accidents. It’s their way of saying “I still need you too”, and with patience it usually passes.

Comparisons make it worse. “Why can’t you be as tidy as your sister?” turns siblings into competitors, and so do labels like “the wild one”. Fair doesn’t mean the same: it means each child gets what they need.

Try today

1. Give each child ten minutes of one-on-one time. Every day if you can, with no phone and no siblings. Let them lead the game. This special time fills the tank that fights drain.
2. Coach instead of judging. If someone is hurt, comfort the hurt child first, so hitting doesn’t win your attention. Then: “You both want the truck. What can we do?” Let them suggest: take turns, use a timer, play trucks together. Under 4, offer two choices. Praise any fair idea.
3. Practice and notice the good moments. In a calm moment, make a family list of fair ways to end a fight: timer, trade, take turns. Then catch them getting along: “You two built that tower together. Great teamwork.” What you notice grows, so let small bickering pass when no one is hurt.

If it gets worse at first. When fights stop bringing a judge, children often call you in louder for a few days. Stay calm, keep coaching, and it fades.

The same answer from every adult. Agree on three house rules with every caregiver: no hurting, no breaking things, everyone gets a turn. If one adult always makes the older child give in, fights move to that adult.

If a new baby is on the way. Link the due date to something your child knows: “when it gets cold”. Read books about babies, let your older child help choose a toy for the baby, and keep their routines the same. Make big changes, like a new bed or potty training, well before the birth or a few months after. Give small jobs, like bringing a diaper. Never leave a toddler alone with a newborn.

What to say

When a fight starts:

“I see two kids who both want the same thing. Let’s figure it out.”

Afterwards, to an older sibling after a new baby:

“The baby needs a lot of help right now. You and I still have our special time.”

The hardest version, when someone gets hurt:

“Stop. I won’t let anyone hurt. Let’s take a break and calm down.”

What to avoid

• Comparing siblings. Even praise by comparison (“you’re the good one”) creates rivals.
• Always making the older one give in. “You’re bigger, let him have it” teaches resentment.
• Taking sides without seeing what happened. Focus on solving, not judging.
• Expecting instant love for a new baby. Mixed feelings are normal. Let your child say “I don’t like the baby today” without shame. Feelings are allowed, hurting is not.

When to get help

Talk to your pediatrician, a child psychologist or a family therapist if one child often hurts the other on purpose or seems afraid of the other, or if the fighting is constant and the house never feels calm. If a child tells you a sibling hits them or touches them in a way they don’t like, believe them, step in and supervise closely while you get help. Reach out too if an older child’s behavior doesn’t settle a few months after a new baby, or if you feel at the end of your rope.

Read together

Quarrel is a story about two children who love each other and still can’t agree. Whyia and her cousin Ethan are waiting for their moms to buy zoo tickets when they start to argue: sloths first, or monkeys? When the grown-ups ask them to say sorry, neither wants to. So Whyia turns into a sloth, and a wise old sloth shows her their way to end a fight: raise a little finger, which means “I’m not saying sorry, but the problem is over.” Ethan raises his little finger too, and later, arguing over cake, they use it again.

Read it with both children. Then make up your own family sign for ending a fight, and use it the next time a toy truck starts a war.