How to tell your child they’re going to be a big sister or brother
Of everyone you’ll tell about the new baby, your older child is the one whose life changes most, and the one least able to picture what that means. This page covers when to tell them, what to actually say at each age, 15 ideas from toddler-simple to party-ready, and how to film their reaction without turning it into a performance.
When to tell your child about the new baby
There’s no perfect week, and plenty of families wait until after the first scan or the end of the first trimester before telling anyone, kids included. If you’ve been through a loss or a long road to this pregnancy, it’s fine to wait longer, or to keep it very simple. A few age-based pointers from child-health sources:
- Toddlers (1 to 2). They won’t understand much about what a sibling means, but you can still bring it up so they get used to the words “baby,” “brother” and “sister,” and picture books help (HealthyChildren.org, from the American Academy of Pediatrics).
- Preschoolers (2 to 4). Months mean little at this age. “The baby will come in summer” works better than “in five months” (KidsHealth). Québec’s Naître et grandir suggests telling children 2 and up once you know the pregnancy is going well, around the second trimester, and notes some parents wait until two or three months before the birth because the wait feels endless to a small child (Naître et grandir).
- School-age kids. Tell them before other people start talking about it. A child who overhears it from an aunt at a birthday party feels left out of something that’s very much about them.
One practical tip from the AAP: if you can, finish big changes like toilet training or the move from crib to bed before the baby arrives, or wait until the baby has settled in, so your child doesn’t link “new baby” with “losing my crib.” If you’re also working out who else to tell and in what order, our pregnancy announcement ideas walk through the whole list.
What to say
Short, honest and about them. Some starting points:
- For a toddler: “There’s a baby growing in my tummy. You’re going to be a big sister.” Then let them touch the bump, and move on. You’ll repeat it a dozen times.
- For a preschooler: “We’re having a baby in the summer. Babies are tiny and they cry a lot and they can’t play yet, but they love watching big kids. You’ll be the big brother.”
- For a school-age child: “We have some news and we wanted you to hear it first. We’re having another baby. What do you think? You can ask us anything.”
- For a preteen or teen: Tell them like you’d tell an adult, in private, and give them space for mixed feelings. Don’t ask them to help with the reveal to everyone else unless they want to.
Be honest that babies are hard work. Kids who expect a ready-made playmate are more likely to be disappointed when a newborn mostly sleeps and cries.
Ideas for toddlers
At this age the “reveal” is less about the moment and more about the idea sinking in over weeks.
1. A book about a new baby
Pick a picture book about becoming a big sibling and read it together the day you tell them. Then keep it on the shelf. Many toddlers want the same book every night for a month, which is exactly the point.
2. A doll or teddy “for practice”
Give them a baby doll or a soft toy, with a tiny blanket, and tell them it’s so they can practice being a big sister. It gives them something to do with the news, and you’ll learn a lot from how they treat it.
3. The ultrasound on the fridge
Put the scan photo next to one of their baby pictures and talk about both. “This was you, before you were born. And this is the new baby.” Seeing their own baby photo helps them understand they were once that small too.
Ideas for older kids
From about four, kids can enjoy a proper reveal and remember it.
4. A promotion certificate
Print a certificate that “promotes” them to Big Brother or Big Sister, with the due month as the start date. Present it with a little ceremony (a handshake, a sticker badge) and let them pin it to their wall.
5. A scratch-off card
Make a card with “You’re going to be a...” and cover “big sister!” with a silver scratch-off sticker. Kids love scratching things, and you get a clear “reveal second” for the camera.
6. A puzzle
A small custom jigsaw with the news on it, or just a photo of the ultrasound. Keep it to a number of pieces they can finish in ten minutes; a frustrated six-year-old is not the reaction you’re after.
7. Matching pajamas with one tiny pair
Hand out matching pajamas for the whole family, then pull out a newborn-size set last. Kids usually work it out faster than adults do.
8. Let them choose a gift for the baby
Take them to a shop and tell them the news on the way: “We’re going to pick the first present for your new brother or sister.” Choosing something gives them a role, and they’ll be proud to give it to the baby later.
Letting them tell everyone else
Many kids love being the messenger. Only do this if yours does.
9. The big-sibling shirt at a family dinner
A T-shirt that says “Big sister” or “Big brother (coming soon).” Have them walk in wearing it and say nothing, then see who notices first. It’s one of the ideas in our guide to telling the grandparents, and it works because the child gets the spotlight.
10. Their drawing as the announcement
Ask them to draw the family “with one more person.” Frame it, or photograph it and send it to relatives as your announcement. It’s theirs, it costs nothing, and it’ll mean more in ten years than any store-bought card.
11. A sign in the family photo
At a gathering, line everyone up for a photo and have your child hold a sign that says “I’m going to be a big brother!” Let them hold it upside down if they want; that’s part of it. Later, if you find out the baby’s sex, kids can take a starring role in that moment too: our gender reveal ideas have several they can run.
At Christmas
12. A present for the sibling-to-be
Under the tree, put a gift labeled to your child “from the baby”: a small toy and a card that says “I can’t wait to meet you, big sister.” It’s a gentle way to frame the baby as someone who already likes them. If you’re telling the rest of the family over the holidays too, our Christmas pregnancy announcement ideas cover the whole gathering.
If the reaction isn’t what you hoped
Tears, a flat “okay” followed by a request for a snack, or a sudden question about where babies come from: all normal. Some kids say they’d rather have a puppy. Some seem delighted and then go back to baby talk a few weeks later; KidsHealth notes that jealousy and regression are common, and suggests looking at the feelings behind the behavior rather than bending the rules.
Keep it simple: tell them you love them just as much, let them say how they feel, and spend some one-on-one time with them that isn’t about the baby. In blended families, a child may feel their place is under threat; Naître et grandir suggests listening to those feelings rather than insisting they be happy, and letting the child’s other parent hear the news before the child does.
Filming kids’ reactions
Kids are the best and worst people to film. A few things that help:
- Put the camera at their eye level, not yours. A phone on a low shelf or a coffee table gets their face; a phone held by a standing adult gets the top of their head.
- Start recording before you begin, and don’t do a second take. A rehearsed reaction looks rehearsed, and asking a child to “do it again” can sour the memory for them.
- Let them react however they react. If they’re upset, put the phone down. The footage isn’t worth more than the moment.
- Think twice before posting. A child’s face online is hard to take back, and they can’t really consent. Share privately with family, and ask older kids before you post anything.
For light, sound and trimming the clip afterwards, see how to film a reaction without spoiling the surprise.
The fake group photo trick
This works well with kids because they’re used to being photographed, so they don’t suspect a thing.
13. “Say ’big sister!’”
Line up the family for a photo. Instead of “say cheese,” the person behind the camera says “Everybody say ’big sister!’” Your child repeats it on reflex, then looks at you. That pause is the reaction.
14. The sign behind them
Ask your child to stand in front for a photo while you and your partner stand behind holding a sign that says “You’re going to be a big brother!” Take the picture, then show them the photo on the screen. They get to discover it twice.
15. Their face, then the news
Tell your child you’ll take their picture and let them pull a silly face. Then turn the phone around: instead of the photo they expect, the screen shows the scan or a big message you prepared in a notes app.
Idea 15 is roughly what Plot Twist automates on an iPhone Duo. Your child watches their own mirrored face on the outer screen while they pull that silly face; after a beeping 3-2-1, the screen switches to a line you’ve typed, since there’s no built-in sibling message (“You’re going to be a big sister!” works), and the back camera captures the moment it registers. The app keeps the raw video in Photos and makes a 9:16 reel on the phone. Nothing is uploaded, which matters when the star is a child, and it only works on iPhone Duo.