“I won’t let you hit the baby. Hitting hurts. I’m moving your body away.”
Do this: Move between the child and the baby immediately. Block or move the older child back with calm firmness. Attend to the baby’s safety first, but do not turn the moment into a long trial. Once the baby is safe and the older child is calm enough to hear you, name the need underneath if you can: attention, turn, space, help, or big feeling.
Skip this: “Why would you do that?” “You know better.” “You’re mean to the baby.” Do not ask the older child to explain while they are still activated. Do not give a long lecture while the baby is crying and the older child is watching your alarm grow.
Expect this: The older child may hit again even after you respond well. That does not mean the response failed. This pattern often changes through repeated prevention, immediate blocking, and giving the older child another way to get your attention before the hit happens.
The hit can seem to come out of nowhere. One minute your older child is playing nearby, asking for a snack, or watching you hold the baby. Then they walk over and smack, push, poke, squeeze, shake, or kick. Sometimes it happens quickly. Sometimes it happens while smiling. Sometimes it happens right after a sweet moment, which can make it even more confusing.
This is one of the sibling moments that scares parents most because the target is so vulnerable. A baby cannot defend themselves. A baby cannot understand what happened. And the older child, who may still be very young themselves, suddenly looks bigger, stronger, and more capable of harm than they did a second ago.
That shift can make a parent’s body react fast. But the older child hitting the baby is usually not the same thing as a child attacking someone with adult intent. It is often a collision of jealousy, displacement, impulse, curiosity, and a need to know where they still belong now that the baby has changed the room.
The baby gets held. The baby gets fed. The baby gets rushed to when they cry. The baby gets soft voices and careful hands. The older child may understand some of this, but their body may still be asking a much more primitive question: Where did I go?
That does not make hitting okay. The safety boundary has to be immediate and non-negotiable. But if the response becomes only alarm and punishment, the older child may learn that the baby is the place where they lose you even more.
The goal is twofold: protect the baby every time, and help the older child find a safer way to reach for connection, power, and place in the family.
Probably normal if... your older child is young, the hitting is impulsive, and it happens around predictable moments: when you are holding, feeding, changing, or soothing the baby, or when the older child is tired, bored, or wanting your attention. It still needs a firm response, but the pattern is common when a new baby changes the family structure.
Worth watching if... the hitting is becoming more frequent, more forceful, more planned, or harder to prevent. Also watch if your older child seems intensely angry at the baby, seeks opportunities to hurt them when adults are not looking, or becomes distressed and ashamed afterward in a way that does not settle with repair.
Get outside help if... the baby is being injured, you cannot safely supervise both children, or your older child seems repeatedly driven to hurt the baby despite consistent safety limits. Get support sooner if the behavior feels frightening, deliberate, escalating, or connected to bigger changes in mood, sleep, aggression, or regression.
This pattern often continues when hitting the baby becomes the fastest way for the older child to get the parent back. That is the emergency-attention loop.
It usually starts because the parent has to react. The older child hits the baby. The parent rushes over, voice changes, face changes, body changes. The baby cries. The room becomes intense. The older child is suddenly at the center of everyone’s attention, even if the attention is angry.
From the parent side, this is unavoidable. The baby has to be protected. From the older child’s nervous system, the sequence can become powerful: baby has parent, I hit baby, parent comes fast.
That does not mean the older child is calculating it coldly. It means the pattern works. A young child does not need to understand the whole family system to learn that one action produces immediate parent intensity.
The second thing that keeps it going is only responding after the hit. If the older child gets very little contact while they are trying to wait, but a huge amount of contact when they hurt the baby, the family accidentally trains the emergency version of the bid. The child may not have enough other reliable ways to say: I need you. I feel pushed out. Look at me. Give me a job. I want to be close too.
The repair is not to ignore the hit. You cannot ignore harm. The repair is to make safe bids work faster than unsafe ones. When the older child comes near gently, notice it.
“You came close with soft hands.”
When they ask for you while you are feeding the baby, give them a small piece of certainty.
“I see you. When the baby finishes this side, it is your turn to sit with me.”
When they look like they are about to move toward the baby with too much energy, intercept before the hit.
“Your body is getting fast. I’m going to help your hands be safe.”
The baby still gets protected. The older child also learns that they do not have to create an emergency to be found.
When your older child keeps hitting the baby, Mabel can build something specific to your family: a safety script for the moment, a prevention plan for high-risk baby-care times, or a story that helps your older child feel their place in the family without making the baby the problem.
