When your older kid acts out after the baby comes
You turn around and your older one has pushed the baby off the sofa, or sat on him, or smacked him on the head on the way past. The baby is screaming, your heart is going, and somewhere underneath the panic there is a flash of anger at a kid you love. Nearly every house that goes from one child to two gets some version of this. It is not a sign that something is wrong with your child, and it is not a verdict on you.
Rough night? Call or text 988, or 1-833-852-6262 (24/7, dads too).
Why it comes out through their hands
Your older one has just been demoted and nobody asked them first. The lap they used to have is full. The person who used to come when they called now says in a minute. A four year old cannot sit you down and tell you they feel replaced, so the feeling goes somewhere else, and at that age it goes into their body.
There is a second thing going on too, and it is worth knowing because it changes how you respond. Any attention is attention. If pushing the baby brings both parents across the room at a sprint, that has worked. Nothing about that is calculated, but it does get learned, which is why the size of your reaction matters as much as what you say.
You will probably also see them go backwards for a while. Potty accidents from a kid who was dry, baby talk, wanting a bottle or a pacifier, needing you to do things they could do themselves last month. That is normal after a new baby and it passes. Telling them to act their age makes it last longer.
In the moment
- Check the baby first. Everything else can wait ten seconds.
- Get between them, calmly. Move your body, not your voice. Pick the baby up or move the older one back.
- Keep it short and flat. “We don’t hit. Hitting hurts him.” Then stop. A long lecture gives the behavior a bigger payoff than it earned.
- Name the feeling, not the crime. “You wanted me and I was busy with the baby. That’s hard.” Kids who feel understood need their fists less.
- Then redirect into something with you. Two minutes of your hands on a puzzle or a book does more than any consequence you can hand out.
- Save the consequences for the pattern, not the single shove. Separating them and ending the play is enough most of the time.
If the baby got hurt
Most of these end with a startled baby and nothing more. But a baby’s head is the part to take seriously, and a baby cannot tell you how they feel, so the rule is lower than it would be for an older kid.
If the baby hit their head and is under two, call the doctor the same day, even if the baby seems completely fine.
Call right away, or go in, for any of these: vomiting more than two or three times, unusual sleepiness or being hard to wake, a bulging soft spot, a seizure, pupils of unequal size, blood or clear fluid from the nose or ears, unusual paleness lasting more than an hour, or a cry you simply cannot settle.
Call 911 if the baby loses consciousness, or gets worse while you are watching them.
You are not being dramatic by calling. That phone call is a ten minute conversation that either reassures you or catches something early, and either one is worth it.
Separately, and this is the one thing to be absolute about: never shake a baby, not even for a second. If you ever think a baby may have been shaken, by anyone, call 911 straight away, because the damage from shaking does not show on the outside and a baby who settles can still be seriously hurt.
What brings it down over the next few weeks
- Become your older kid’s person. This is the single thing that helps most, and it is the thing a dad is best placed to do. Bedtime, breakfast, the drive, the pool on a Saturday. Something that is theirs and yours and does not include the baby.
- Ten minutes a day, their choice, phone down. Short and reliable beats long and occasional. Ten minutes every day is worth more than an hour on Sunday.
- Stop making the baby the reason for every no. “Not now, the baby’s sleeping” fifteen times a day teaches them exactly who to blame. Say “not right now, but after lunch” where you can.
- Give them a real job. Fetching the diaper, picking the outfit, being the one who can make the baby laugh. Being useful beats being told to be gentle.
- Catch the good stuff out loud. “You were so gentle with him just then.” Most kids hear about the baby only when they have done something wrong.
- Let them be little. If they want to be carried or want the bottle for a week, let it happen. It is faster through than around.
- Don’t leave them alone together yet. Not as a punishment, just as the setup. A gate, a playpen, or the baby in your arms while you deal with the older one removes most of these moments before they start. Your pediatrician can tell you when your own kid is ready for more room.
The part dads don’t say out loud
This is the moment a lot of fathers come closest to really losing it, and it catches them off guard. It arrives as fear and anger in the same second, about a kid you would do anything for. Then comes the guilt for how angry you got at a four year old who is also, when you think about it clearly, having the worst few months of their short life.
If you find yourself at that edge, the order is: baby somewhere safe, older one out of the room, sixty seconds before you say a word. Nothing you say in that first minute will be better than what you say after it.
If you are getting there regularly, that is not a character flaw, it is a load problem, and there are pages here for it: when the crying makes you cringe and worn down as a new dad. If you are getting to the edge of hurting someone, put the kids somewhere safe and call or text 988 right now. That is what it is there for, and asking before something happens is the strong move.
When it’s more than a phase
Most of this fades over a few months as the house finds its shape. Talk to your pediatrician if:
- It has been going on for more than a few weeks and you are not coping with it.
- Anyone is actually getting injured.
- Your child is attacking you or other adults.
- They are being sent home from preschool or other parents stop inviting them.
- You find yourself genuinely worried about leaving the two of them in a room together.
None of that means something is wrong with your child. It means this is bigger than a parenting tweak, and the help for it works better the earlier it starts. A pediatrician is the right first call, not a last resort.
And if the whole two-kid thing is what is flattening you, there is more on that in going from one kid to two.
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Common questions
Why is my older child being rough with the new baby?
Because something changed and they cannot say so in words. A toddler or preschooler who has gone from being the only one to sharing you has no way to explain that, so it comes out through their hands. It is one of the most common things that happens in a house that just added a baby, and it is not a sign of a cruel kid or bad parenting.
What should I do when my older kid hits the baby?
Check the baby first, then get between them calmly. Keep your response short and flat: we do not hit, hitting hurts. Long lectures and big reactions can make it happen again, because any attention is attention. Then give the older one something to do with you.
Should I call the doctor if my older child hurt the baby?
If the baby hit their head, call the doctor the same day for any baby under two, even if the baby seems fine. Call right away or go in for vomiting more than two or three times, unusual sleepiness or trouble waking, a bulging soft spot, seizures, unequal pupils, blood or clear fluid from the nose or ears, or a cry you cannot settle. Call 911 if the baby loses consciousness or gets worse while you are watching.
When is acting out more than a phase?
Talk to your pediatrician if it has gone on for more than a few weeks and you are not coping, if anyone is getting injured, if your child is attacking adults, or if you find yourself worried about leaving them in a room together. Getting help early works better than waiting it out.
How do I stop losing my temper when this happens?
This is the moment a lot of dads come closest to losing it, because it is fear and anger at the same time. Put the baby somewhere safe, take the older one out of the room, and give yourself sixty seconds before you say anything. If you are getting there often, that is worth talking to a doctor about rather than white-knuckling it.
Last updated October 2026. Postpartum Fathers is peer support, not medical advice. Sources: AAP on head injury for the warning signs and the under-two rule, AAP on aggressive behavior in young children for what helps and when to call the pediatrician, and AAP on helping siblings adjust on regression and one-on-one time.