At first, your new baby won’t pose much of a threat to your firstborn’s precious possessions, jealously guarded space, and self-appointed status as head honcho. But once your baby starts to crawl (and snatch stuff), expect the turf wars to begin in earnest.

"Any other toddler mamas dealing with jealousy? I know it’s normal and expected it, but it’s really hard," says What to Expect Community parent babyzee. "Our 2-year-old wants to be held by the parent holding the baby, wants her diaper changed whenever baby is changed, tells us not to pick up baby… We’re trying to give her lots of love and some one-on-one time. Any advice or solidarity? Definitely the hardest part of postpartum for me right now."

Wondering how can you help your children grow up (mostly) rivalry-free for the long haul? Read on.

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Key Takeaways
  • Sibling rivalry can start as babies become mobile and parental attention shifts. Your toddler — especially if he's under age 3 — may struggle with sharing, boundaries, and feeling “demoted,” which can spark frequent conflicts.
  • You can help ease the transition by modeling sharing yourself, setting realistic expectations, protecting each child’s special belongings, using tools like timers, praising both kids evenly, and stepping back occasionally so they can practice problem-solving.
  • Whenever possible, validate your older child's big feelings. Allow for verbal venting, but clearly stop physical aggression and enforce fair, consistent consequences for both children.

What causes toddler sibling rivalry after a new baby arrives?

For one thing, toddlers and young preschoolers are practically defined by their need to claim every last thing they see as “mine!” — and babies aren’t exactly known for respecting property rights. For another, all the attention your newborn gets for being, well, a newborn, may leave your numero uno feeling like he’s been demoted to second-class citizen.[1]

What’s more, if your older one is still pretty young (as in under 3) he’s still probably not fully getting this whole sharing concept you’re always touting.[2] Especially when it comes to sharing with the space-invading grab machine you call his little brother.

How to ease sibling rivalry

Feeling jealous of a new sibling is normal at this age. Here's how you can help smooth the transition:

Show them how to share

Taking turns and sharing prized possessions can be tough, even for grown-ups — and like just about all social skills, these key ones must be learned.

So, first off, get ready to teach through your generous example. Model the big-hearted behavior you’d like to (one day) see in your kids: Offer both of them a piece of your muffin, a turn at your computer, a chance to pick out what’s for dinner.

Let them catch you sharing (“there’s only one pretzel left — let’s split it”), inviting someone with just two items to go ahead of you on the supermarket line, or giving up your seat for an elderly woman on the bus. Play games that encourage turn-taking, like rolling a ball, and suggest activities that encourage a group effort, like drawing on an extra-large piece of paper.[3]

Keep them real

Your expectations, that is. It’s not realistic to expect your older child to share everything with his little bro, and it’s not really fair, either. Rights are a two-way street, and if you’re always asking your eldest child to relinquish his in favor of his sib’s because “he’s just a baby,” resentment’s sure to brew.

Letting your older child know that certain belongings are his and his alone will help him feel less possessive — and, if you’re lucky, more inclined to share the rest of his stuff. Make sure you follow through with protecting those rights too (instead of always giving the baby his way).

A good time for your older son to play with his exclusive treasures — and to play in a pest-free space: baby’s nap. Did you catch your firstborn in the act of sharing, or taking turns with his sibling? Pour on the praise. Did you catch him instead shoving his brother away from his block project? Criticize his behavior, not him.

Time turn-taking

Tired of being The Enforcer of taking turns? Turn to a timer. Objective and unequivocal, a timer can take uncertainty out of the turn-taking equation when your younger child gets a bit older, encouraging cooperation and sharing.

Use the timer to set limits on how long each sibling can play with a certain toy before turning it over to the other (of course, each should receive the same time limit). It may take a few tries before your little ones learn to respect the buzzer — but once they start to see that what goes around (their sib’s turn) comes around (their turn), you’ll face fewer fights over communal property.

Be an equal-opportunity praiser

Sure, your little one is making developmental leaps and bounds. But as you celebrate those accomplishments (as you should), make sure you don’t take your older child’s skill sets for granted. That — if you remember back to your own sibling days — can fuel sibling rivalry (as in “Mom likes you better!”). If you find yourself praising your baby’s newfound ability to grasp his spoon, be sure to crow over your preschooler’s agility when it comes to pouring the milk.

Give refereeing a rest

If you’re always quick to step into a sibling conflict, they’ll never learn how to resolve one on their own (and remember, sibling play is great social practice). With a little guidance, even young siblings can work together to find ways to share.

When you spy a tug of war over that plastic hammer, wait a minute to see if they can figure out a compromise. That’s clearly not happening? Step in calmly and ask your older child how he thinks he might stop the struggle. He just might pick up on your impartial, problem-solving approach (and your respect for his big-kid abilities) and come up with a suggestion — like using a different tool while his baby sib swings the hammer, or setting the timer so they can both take a turn. (If he doesn’t come up with this, a little power of suggestion goes a long way, Mom.)

Open the vent

Little siblings can be irritating, and so can sharing everything you used to have all to yourself (including your parents). Let your older child know that it’s okay to vent the angry feelings everyone feels sometimes. Just keep your perspective (and cool) as he does (he’s not up to self-editing yet).

When he says, “I hate Braden — I wish he would go away forever!” he’s just expressing his very normal angry feelings about a sibling who knocked over the block tower he just spent all morning toiling over. So skip the “What a terrible thing to say — you don’t mean that” (because of course he doesn’t mean it, not literally).

Instead, help him feel understood. Empathize: “You’re really angry at Braden because he knocked down your tower. You worked really hard on that.” Don’t try to explain away the baby’s behavior (“he doesn’t know any better”), because that won’t help him feel heard — and it won’t bring back his tower. The key is for him to know that his emotions are valid and justified, so he can let the rest of his anger go.

Have more questions about navigating toddler development with a new sibling? The What to Expect app is your guide to the toddler years, with expert-backed articles and tips from other parents.

But don’t let things get physical

No matter the precipitating offense, be clear that venting anger by hurting another person is unacceptable.

Let your child know in no uncertain terms that if he hurts his brother he’ll have a time-out. Be straightforward, not emotional, about following through, but be evenhanded when it comes to discipline.

If your younger child is the aggressor — he’s pulling his brother’s hair or biting him — remove him from the scene and take him to the crib to chill. Showing your firstborn that you don’t play favorites will help him respect the rules (and you).