After a sibling arrives, a once-gentle firstborn may sneak a pinch or push and hit the baby, which can alarm and worry parents. Behavior like this is fairly common in children under five, and it is often linked to limited language for expressing jealousy, worry, or frustration, so feelings come out through the body.
Why It Happens
CDC materials describe behavior, good or bad, as a form of communication and note that attention, whether positive or negative, reinforces behavior. A new baby splits a parent’s time and gaze, and an older child may try to win it back in the most noticeable way available, which can be hitting. If a parent reacts strongly, the child may learn that even negative attention is attention. If calm behavior goes unnoticed, the hitting can return.
How It Differs by Age
AACAP offers wording matched to age. For a child of 1-2 years, keep it short: “No hitting. Hitting hurts.” For ages 2-3, acknowledge the feeling first: “I know you are angry, but don’t hit. Hitting hurts,” which begins to build empathy. By ages 3-5, children can talk about what happened, so you can practice other options together, such as stomping feet, saying “no” loudly, or calling a parent. AACAP also notes that hitting a child who is hitting teaches aggression.
Managing It at Home
First, protect the baby right away and say one calm, low sentence. CDC gives examples such as, “Hitting is hurting. Our rule is no hurting. Keep your hands to yourself.” Second, if it keeps happening, CDC describes a brief time-out: seat your child somewhere quiet without eye contact or talk, and keep it short, about 1-3 minutes depending on age. Third, tell your child what to do instead. If the baby touches a toy, they can say “stop, that’s mine” or come get you. Fourth, catch good moments with specific praise: “You touched your brother gently.” Fifth, set aside 10-15 minutes of one-on-one time daily. Sixth, with a newborn, avoid leaving the older child and baby alone together.
Common Misunderstandings
Scolding a child for feeling jealous can lead them to hide feelings and show them only through actions. Accepting the feeling while drawing a line around the behavior tends to work better. Telling the older child to “give in because they’re the little one” can build resentment, and yelling or physical punishment tends to be less effective. It is also common for one or two corrections not to stop the behavior. Change often shows up after several weeks of consistent responses.
When to Consider Talking with a Pediatrician
Consider a pediatric visit if the baby is hurt enough to need medical care, if hitting persists or grows worse despite several weeks of consistent responses, or if your child frequently attacks other children in several settings such as daycare or the playground. This information isn’t a diagnostic tool and doesn’t replace advice from a medical professional.