Write it to be read once, then kept
Most cards for adults are read once and recycled by Friday. A card for an older child has two lives. It gets read, or read aloud, in a noisy week when the house smells of other people's casserole dishes, and then it turns up again months later at the bottom of a drawer, in a different house season entirely. Write for both readings. The first reading needs short lines and big, clear sense. The second one needs a detail worth keeping.
Reading level is the decision people skip. A three-year-old will not decode your card at all, so write that one for the adult reading it aloud: short sentences, words that sound good in a kitchen, one picture they can point at. A six-year-old who is sounding out words at school will work through a card line by line and stall on anything long, so keep sentences under about ten words and put the child's name where they will find it early. A ten-year-old reads fluently and hates being written down to, which means plain adult wording, no baby talk, and no giant letters. Teenagers read fast and privately. Short is respectful with a teenager; three good lines beat a page of warmth they have to perform gratitude for.
Leave room in the card, literally. A blank half page at the end is not wasted space for a child between four and nine. It is where the reply goes. Children answer cards with drawings, stickers, and once, in my hearing, a list of rules for the baby written in purple felt tip. If you fill every panel with your own words, there is nowhere for that answer to live, and the card stays a lecture instead of becoming a thing they own.
One more practical point. Put the date on it, in full, somewhere small. Adults date cards out of habit for babies and forget for older children, and the kept version of this card is the one where the date does the memory work later, long after anyone can recall which week the baby came home.
Before the baby comes home is a different card from after
Timing changes what the card is allowed to say. A card given during the pregnancy, or at a baby shower where the older child has been dragged along and handed a biscuit, is a preparation card. It can look forward. It can name what is coming in plain terms and promise one thing that will not change. It cannot congratulate, because nothing has happened yet, and a child who is quietly unsure about the whole plan can hear early congratulations as a decision already made about their feelings.
The card given in the first days after the birth is a recognition card. The baby is here, the house is upside down, and the older child's world has actually moved. That card should write about what has already happened: the meeting, the hospital visit, the first night, the small thing the child did or said. Past tense is the kindest tense in week one. It tells the child you are describing their real life, not a hoped-for version of it.
I wrote one of these for Isadora, six, in Wicklow, on the evening before her brother came home from the hospital. I kept it to four short lines in large, clear writing and left the back of the card blank, because she was at the stage of reading everything in the house aloud, including the backs of cereal boxes at breakfast. She read the first line out loud to the kitchen in general. Then she turned the card over, found the empty side, and spent much longer on that, drawing her brother as a round potato shape with two arms and a serious face. Her mother kept the drawing, not my four lines. I have thought about that ordering of value a lot since.
A third timing gets missed. The card sent six or eight weeks later, when the visitors have stopped coming and the older child has settled into the flat, tired middle of the change, lands harder than either of the first two. Nobody writes that card, because the occasion feels over. It is not over for the child. If you missed the birth week entirely, send the late card and say so plainly, instead of folding a line for the older child into a belated card for the parents, where it reads as an afterthought because it is one.
Pick the part of their life the baby does not share
The strongest line in this card is rarely about the baby. It is the line that picks out one corner of the child's life and confirms the baby gets no share of it. Their bedroom, and the fact that its door still shuts. The Saturday swim, at the same time, with the same adult. The story at bedtime that stays at the old length. A grandparent's house where they are still the only grandchild in the room. Pick one. Name it exactly. Then stop, because a list of five untouched things starts to sound like a negotiation, and children can hear the anxiety underneath a list.
This works because it answers the question the child is actually asking, which is not whether the baby is cute. It is whether their place got smaller. A card that spends six lines on the baby and one line on the child has answered that question the wrong way round, whatever it intended. Aim for the opposite ratio in a card for a child under ten: most of the card about them, their week, their unchanged things, and the baby arriving in the last line or two, the way the baby has arrived in the house, as the newest thing rather than the main thing.
Choose the unchanged thing with some care. It has to be true in three months, not just this week. Promising that bedtime will never move, or that the baby will never be in their room, writes a cheque the household will not cash, and children keep receipts. Pick the durable version: the swim that is booked and paid for, the grandparent trip already on the calendar, the shelf, the chair, the song. Small and certain beats grand and shaky every time in a card a child may reread in a hard week.
Model cards from a parent
A parent writing this card carries a weight nobody else carries, because the parent is the person whose attention has visibly moved. So the parent's card should not try to be cheerful at the child. It should be steady. One unchanged thing, one noticed detail from the last few days, and one line that is only about the two of them. Borrow the shape of these and replace every detail with your own.
- This card is just to say your swimming lesson stays on Saturday, at the same pool, and I will be the one in the hot seats watching, the way I always am. The baby will be at home being small and loud. Your lane is yours, and nobody is putting a baby in it.
- You met your brother on Tuesday and told the midwife his head smelled like warm bread. I keep thinking about that. Nothing about our mornings has to change because he is here, and your toast still gets cut in triangles, not squares.
- This card is not about the baby. It is about you finishing that enormous jigsaw with the lighthouse on it while I was in hospital, all 300 pieces, and nobody helping. I am proud of that in a way I have not said properly. Love, Mum.
- The sign you made for your door stays where you put it, and the door still closes whenever you want the room to yourself. Nobody feeds a baby in there without asking you first. When you want company, you know where the rest of us are.
- I know this week has been a lot of waiting in corridors and other people's houses. Thank you for the waiting. On Sunday, when things are quieter, you and I are going to the shop with the good ice cream, just us, and you can take as long as you like choosing.
- One day your sister will be big enough to argue with you about the television. That day is not this year. This year she mostly sleeps, and you are still the only person in this house who can beat me at cards. That title is safe for a long while.
Notice what none of those cards does. None of them asks the child to help, to be patient, or to love anybody. A parent can ask for those things in ordinary life, in the moment, with a reason attached. In a card, which gets kept, they read as the terms of the new arrangement, and that is a poor thing to put in a card a child will keep.
Model cards from a grandparent, an aunt or uncle, or a family friend
Every other sender has an advantage the parents do not: their relationship with the child has not changed at all. Use it. The grandparent, aunt, uncle, godparent or family friend can write the card a parent cannot, the one that says my end of your life is exactly where it was. These cards can also be lighter. An outside sender is allowed to be funny about the baby in a way that would sound dismissive from a tired parent at the end of a long day.
- News reaches me that there is a new baby at your house. Fine. Thursdays at my house are unchanged: your mug is here, the biscuits are the ones you like, and nobody small is invited. See you at four, as usual.
- Congratulations on your sister, who I am told is very small and does a lot of sleeping. You remain the reigning champion of the garden hose fight, a title she cannot contest for several years. Defend it wisely.
- I have known you since you were the size your brother is now, and I watched you eat sand at the beach that summer, so we have history. When you want a house with no baby in it for an afternoon, mine is available and the dog misses you.
- Your mum tells me you have been reading to the baby from your school book, even the hard words. That is a kind thing to do for someone who cannot say thank you yet. She will owe you. I suggest you keep a list.
- Being the oldest in a family is a long job with good parts nobody mentions. You get asked first. You get trusted first. You also get to teach your brother the house rules, and I suggest you write them down before he can argue.
- Here is a card that is only yours, because I thought the baby was getting quite enough post this week. Inside is the drawing you left at my house in August, the one of the boat. I kept it on my fridge and I am not giving it back, but I wanted you to know it is still up.
Outside senders should still check one thing before posting: how the parents are handling visitors and gifts in the first fortnight. A card is almost never a problem. A card with money, a present, or a plan to visit inside it can land in the middle of a household that is rationing all three, so keep the card as a card and make any offer of a visit by phone, separately, where it can be refused without spoiling the envelope.
For a child whose feelings about the baby are not simple
Some older children are thrilled. A good number are not, or not yet, or not on the days when the baby cries through breakfast. The card for that child should leave the door open instead of painting a smile on it. Do not write that they are excited if they have not said so. Do not write that they love the baby already. Write what is true and observable: that a big change has happened, that it is a lot, that you are still there, and that they do not have to perform anything for you.
Lines like these belong in a blockquote because they are the ones to cross out of your draft, kindly meant and quietly heavy:
You are going to be such a help to your mum with the baby. Big sisters are never jealous of their brother. You must be so excited, everyone is waiting to see you hold her.
Each of those lines hands the child a feeling or a duty and then waits for them to agree with it. A child who is struggling will agree out loud and keep the real feeling somewhere private, which is the opposite of what a card can do at its best. The better version is shorter and leaves space: a big week, a noisy house, no requirement attached. Cards for this child also travel better without an audience. Hand it over quietly, or leave it somewhere they will find it alone, rather than reading it out at a family gathering where their face becomes part of the entertainment.
Age changes the handling, not the principle. A four-year-old who is out of sorts needs the card read once, warmly, and then put where they can reach it, with no test afterwards about whether they liked it. A nine-year-old may want to write back, or may put the card face down in a drawer for a month, and both of those are complete responses. A teenager who is finding the change hard will usually accept a short, dry, honest card from an adult they trust and reject anything that sounds like a lesson in sibling love. Match the card to the child you have, not the reaction you were hoping for.
What to leave out of this card
The helper job description is the main one. Fetching nappies, watching the baby while a parent showers, being the responsible one: these may all happen in daily life, but printed in a card they become the child's new title, and plenty of older children go quiet at exactly that moment. If you want to thank a child for a specific thing they already did, name that past act with its date. Do not recruit them for future ones.
Leave out the promises made on the baby's behalf. The baby has not chosen a favourite person, does not yet look up to anyone, and has not been waiting to meet their big brother, however lovely those lines sound in a card shop. Older children over seven know this perfectly well and discount the whole card when they spot an invented feeling in it. Write in your own voice about your own feelings, which are real, and let the baby stay a baby: small, asleep, and not yet in a position to endorse anybody.
Comparisons go out too, in both directions. Do not tell the child they were an easier baby, a harder baby, a bigger baby, or a quieter one. Every one of those lines starts an account the siblings will still be settling as adults. The same applies to warnings dressed as humour about being displaced, demoted, or no longer the baby of the family. Adults find those jokes funny because they are not the person the joke is about. In a card that gets kept, a joke like that has a very long shelf life, and not the kind you intended when you bought the envelope.
Finally, keep instructions for the parents out of the child's card. Notes about feeding, visiting hours, gifts for the baby, or questions about the birth do not belong inside an envelope with a six-year-old's name on the front. Children open their own post with great ceremony. Whatever is in there should be theirs, all the way down.
Turn it into a group card
A group card suits this occasion better than people expect, with one condition: every signer writes to the older child, not to the family in general. Set that rule when you send the link round, in plain words, or half the lines will drift toward the parents and the baby and the child will get a card that is about them in the address line only. A grandparent, two aunts, a neighbour and a family friend each adding two lines about the child is a powerful object for a seven-year-old to be handed.
Gathering the senders takes some organising when the family is spread out. A group card with several signers makes that gathering practical when the family is spread out, and you can create a card online and send one link to everyone instead of posting a single card around three counties during the busiest fortnight of the year. The congratulations ecards page covers the wider set of occasions if the same group will be signing again soon for the parents as well.
Keep the two cards separate in your head. The parents' card is a different object with a different job. For the parents themselves there is a separate bank of congratulations on a new baby messages. Their replies afterwards are covered by the baby shower thank-you guide. And when this baby reaches a first birthday, the first birthday wishes bank is waiting. This card has one reader. Write to that reader and nobody else, and it will do work that none of the others can.
The family in Wicklow had an elderly spaniel who was not allowed in the baby's room and appeared to know the rule precisely. All that first week he lay in the doorway with his body on the landing side of the threshold and one front paw placed over the line, watching the cot. The door is usually open now and the baby is walking, and last I heard he still takes up the same position in the mornings, paw included, although nobody in the house can remember deciding that he should.