Why Your Toddler, Preschooler, or Kindergartener May Have More Tantrums After a New Baby Arrives

Why Your Toddler, Preschooler, or Kindergartener May Have More Tantrums After a New Baby Arrives

You bring your newborn home and suddenly your older child seems like a completely different kid. Your toddler is having tantrums over everything. Your preschooler suddenly wants you to dress them even though they have been dressing themselves for months. Your kindergartener is melting down over something that normally wouldn’t bother them.

You may also notice more hitting, whining, clinginess, bedtime struggles, bathroom accidents, baby talk, or an overwhelming need to be held.

Parents often ask me: What happened?

A huge change happened! Your child got a sibling.

And while welcoming a new baby may be exciting and joyful, it is also an ENORMOUS transition for a young child.

Look at the Change Through Their Eyes

Before the baby arrived, your child had a certain understanding of their family and their place within it. Then suddenly there is a tiny person who needs an incredible amount of your time and physical attention.

You’re feeding the baby.

You’re changing the baby.

You’re holding the baby.

The baby is crying while your child is trying to tell you something.

Your child asks you to play and hears, “Hold on, I’m feeding your baby sister.”

Then grandparents, friends, and visitors arrive and immediately ask:

“Where’s the baby?”

“Can I hold the baby?”

“Isn’t the baby adorable?”

Adults understand why a newborn requires so much attention. A toddler, preschooler, and even a kindergartener may not.

They may simply experience: There used to be more of you available to me. Now there isn’t.

Tantrums May Be Communication

Young children don’t always have the language or awareness to tell you:

“I miss having you to myself.”

“I’m jealous.”

“I don’t know where I fit anymore.”

“I love my sibling, but I also wish things could go back to how they were.”

“I need reassurance that you still have enough love and attention for me.”

Instead, those feelings may show up through behavior. Your child may scream because you poured their water into the “wrong” cup. They may refuse to put on their shoes. They may hit. They may suddenly insist that you feed them. They may want to sleep with you. They may start talking like a baby. They may fall apart over something that seems completely unrelated to their sibling.

Instead of looking ONLY at the behavior, ask yourself:

What is my child trying to communicate to me right now?

The cup may not really be about the cup.

Regression Doesn’t Mean You Need to Push Them to Be “Big”

One of the most common reactions adults have after a new baby arrives is to emphasize how grown-up the older child is.

“You’re the big sister!”

“You’re a big boy now.”

“You can do that yourself.”

But imagine watching your sibling receive enormous amounts of attention precisely because they are little, and then repeatedly hearing that you are big.

Your child may not experience being “the big kid” as the compliment you intend. Give them opportunities to be capable and independent, but also give them permission to STILL be little.

If your four-year-old suddenly asks you to help put on their pajamas, you may occasionally help. If your five-year-old wants to climb into your lap while you’re holding their sibling, make space when it is safe and possible. Independence doesn’t disappear because we nurture a child through a transition.

Connect Before You Correct

When your child is in the middle of a tantrum, that isn’t necessarily the moment for a lecture. First, help them get through the feeling safely.

You may say:

“I’m right here.”

“I see you’re having a hard time.”

“I won’t let you hit. These hands are for helping, not hurting.” (See hitting blog)

“When your body is calm, I may help you.”

Once their body is calm, you may validate what happened and give them language for the experience. “You really wanted Mommy to play with you, and I was feeding your brother. Waiting felt really hard.” You aren’t saying that hitting or screaming is acceptable.

You are helping your child understand the feeling underneath the behavior while continuing to hold the boundary.

Give Them Small Moments of Undivided Attention

Parents sometimes hear “one-on-one time” and imagine that they need to arrange an elaborate outing with their older child.

It doesn’t have to be elaborate. Look for small, predictable moments of connection throughout the day. Read a book together while the baby sleeps. Let your child help you make breakfast. Sit on the floor and play for ten minutes. Take a short walk together. Draw. Knead bread. Cuddle and tell a story.

The important part is your presence.

Young children often move between periods of outward activity and quieter, inward moments. Creating those calmer moments of connection throughout the day may be particularly helpful during a major transition like welcoming a sibling.

Tell Them About When THEY Were the Baby

This is one of my favorite strategies after welcoming a new sibling. When everyone is admiring the newborn, include your older child in the conversation. When someone says, “Look at those tiny feet!” you may turn to your older child and say: “I remember when your feet were this tiny. I used to kiss your little toes.”

While you’re burping the baby: “When you were little, I used to rub your back just like this.”

When the baby starts crawling: “I remember the day you started crawling! You went straight for…”

Pull out photographs and videos. Tell them their stories. You are reminding your child that they were once cared for in exactly this way, and that their story still matters.

Be Careful About Blaming the Baby

Pay attention to how often the baby becomes the reason your older child cannot have you.

Instead of: “I can’t play because I have to feed the baby.”

You may say: “My hands are busy right now. You may bring your book over and we can look at it together.”

Or give your older child something special that happens during feeding time.

I have previously shared the idea of creating a “feeding box” - a special activity box that only comes out while you feed their sibling. Suddenly feeding time isn’t simply the moment when your child loses access to you; it also becomes associated with something special for them.

Language matters

Give Them a Role: Without Making Them Responsible for the Baby

Toddlers and preschoolers often love having meaningful jobs. Your child may bring you a burp cloth, choose the baby’s pajamas, sing to their sibling, or help put diapers away. But these jobs should feel like invitations rather than obligations. Your older child doesn’t need to become another caregiver simply because a new baby has arrived.

Sometimes they may want to help.

Sometimes they may want nothing to do with their sibling.

Both may be part of adjusting.

Remember That Love and Jealousy May Exist Together

Your child may adore their new sibling and still wish the baby would disappear sometimes. Those feelings don’t cancel each other out. Adults have complicated feelings. Children do too.

Our job isn’t necessarily to convince them:

“But you LOVE your sister!”

Instead, make space for what they’re actually experiencing.

“You really wanted it to be just you and me right now.”

“I hear you.”

“You wish I could hold you.”

Then maintain whatever boundary is necessary while staying connected.

The Goal Isn’t to Eliminate Every Tantrum

Tantrums aren’t necessarily evidence that you’ve handled the sibling transition incorrectly. Your child is learning how to live inside an entirely new family dynamic.

There may be more tears.

There may be more clinginess.

There may be regression.

There may be days when your child seems completely adjusted and days when everything suddenly feels hard again.

Rather than asking, “How do I make this behavior stop?”

Try asking:

“What might my child be telling me through this behavior?”

Hold the boundary. Keep everyone safe. Validate the feeling. Create opportunities for connection.

And most importantly, remind your older child through your words and actions:

There is still room for you here.

There is still time for you.

And there is still room for you to be little, too.