A new baby is the first experience most children have of involuntary change. Nobody asked them if they wanted a sibling. Nobody consulted them on the timing. And the person they depend on most in the world is about to be holding, feeding, and staring at someone else for months. The jealousy, the regression, the quiet fury of a three-year-old who's been dethroned. these are not problems to solve. They're feelings to name, hold, and wait out.
This guide draws from the AACAP's guidance on sibling adjustment, Dr. T. Berry Brazelton's work on family transitions, and the Faber and Mazlish approach to sibling conflict (Siblings Without Rivalry).
During pregnancy: involve them without overwhelming them
Tell them in the second trimester. Before that, pregnancy is too abstract and the wait is too long. After that, there isn't enough time to adjust. Let them feel the baby kick. Let them help choose a name. Let them set up the baby's room. Involvement creates ownership.
Don't overpromise. "You're going to have a best friend!" sets up a disappointment when the baby arrives and can't play, can't talk, and won't stop screaming. Better: "The baby will be very small at first. Babies sleep a lot and cry a lot. After a while, the baby will start to smile at you, and that's going to feel really good."
Read books about new siblings throughout the pregnancy. Not once. repeatedly. The repetition processes the concept the way repetition processes any new idea for a young child.
After the birth: protect their time with you
The AACAP recommends maintaining one-on-one time with the older child, even if it's just 15 minutes a day of focused attention. "This is your time. The baby is sleeping and I am all yours." This is the most evidence-supported intervention for sibling jealousy.
Let them regress. The older child may want a bottle, want to be carried, want to sleep in your bed, want to use baby talk. This is not going backward. It's testing whether the rules still apply to them. whether they're still loved even though they're not the baby anymore. Let the regression run its course. It passes faster when it's not fought.
Don't say "you're the big kid now." This reframes their childhood as over, which is terrifying. They're still a kid. They just happen to also be a sibling now.
Name it without shaming it. "I think you might be feeling jealous. That makes sense. The baby is getting a lot of attention right now, and you miss having Mommy to yourself. I miss our time together too."
Never say "you should love the baby." Love isn't an obligation, and demanding it produces resentment, not affection. The love comes. on the child's own timeline, usually the first time the baby smiles at them or laughs at something they did.
Give them a role that has genuine value. "Can you bring me a diaper?" is a chore. "Can you sing to the baby? She calms down when she hears your voice" is an identity. The older child needs to feel needed, not displaced.
Books that help:
See our full collection: Books About Getting a New Sibling