Preparing Your Child for a New Sibling

Age-specific strategies for before, during, and after the new baby arrives

What Happened

A new baby is joining your family, and your older child's world is about to change in ways they cannot fully understand yet. This is exciting, but it is also genuinely disruptive to a young child's sense of security. Their experience of being the center of your attention is shifting, and how you handle this transition matters. The good news: sibling relationships are among the most enduring and influential relationships in a person's life, and there is a great deal you can do to set the stage for a positive bond. Children's reactions to a new sibling vary widely based on age, temperament, and preparation. Toddlers (1-2 years) may not understand the concept at all. Preschoolers (3-4 years) may be excited but also jealous. School-age children (5+) may have complex feelings. All reactions are normal, and regression (in toileting, sleep, or behavior) is common and temporary.

Key Facts

  • Toddlers (12-24 months) have limited understanding of what "a new baby" means. They cannot project into the future or understand that the baby is permanent. Focus on maintaining routines and providing extra physical affection rather than detailed explanations.
  • Preschoolers (2-4 years) are the age group most likely to struggle with a new sibling. They are old enough to understand that attention is being shared but too young to regulate the big emotions this triggers. Jealousy, regression, and acting out are developmentally normal responses.
  • School-age children (5+ years) can understand the concept and may be genuinely excited to help. However, they may also feel displaced, worry about their role in the family, or resent the disruption to their routine. Their feelings deserve validation even when they seem disproportionate.
  • Regression is the most common behavioral response to a new sibling. A potty-trained child may have accidents, a good sleeper may start waking at night, a child who eats independently may want to be fed. This is temporary and is not a sign that something is wrong - it is a normal response to stress.
  • The timing of telling your child depends on their age. For toddlers, wait until late pregnancy when the belly is visible and the arrival is imminent. For preschoolers, the second trimester is often appropriate. For school-age children, tell them early enough that they do not hear it from someone else.
  • Research from the Gottman Institute shows that the first-born child's adjustment to a sibling is significantly influenced by the quality of the parent-child relationship before the baby arrives, not just what happens after. Investing in your relationship with your older child now is the best preparation.

What to Expect

  • During pregnancy: Your child may be curious, excited, indifferent, or a mix of all three. Read age-appropriate books about new siblings, involve them in preparations (choosing a stuffed animal for the baby, helping set up the nursery), and answer questions honestly but simply.
  • At the hospital: Many hospitals allow siblings to visit. Arrange for a trusted person to bring your older child to meet the baby. Let the older child come to you (rather than finding you already holding the baby) - some parents set the baby down in the bassinet so their arms are open for the older child first.
  • First weeks home: Expect disrupted routines, big emotions, and testing behavior. Your older child is processing a massive change. They may swing between adoration and hostility toward the baby, sometimes within minutes. Both reactions are normal.
  • The "regression window" typically lasts 2-6 weeks and then gradually improves as the new normal becomes familiar. If regression persists beyond 2-3 months or worsens significantly, discuss it with your pediatrician.
  • Your own emotions matter too. Many parents experience guilt about "doing this" to their older child, grief about the end of the exclusive relationship, and exhaustion from meeting two (or more) sets of needs. These feelings are common and valid.

When to Worry

  • If your older child is physically aggressive toward the baby (hitting, pinching, throwing objects at the baby), never leave them unsupervised with the newborn and address the behavior calmly but firmly. If aggression is persistent or escalating, talk to your pediatrician.
  • If regression (toileting accidents, sleep disruption, clinginess) does not begin to improve after 2-3 months, or if new behavioral problems emerge (extreme tantrums, self-harm, significant changes in eating), seek guidance from your pediatrician or a child psychologist.
  • If your older child expresses persistent sadness, says things like "you don't love me anymore" beyond the initial adjustment period, or withdraws from activities they used to enjoy, this warrants attention and possibly professional support.
  • If you find yourself feeling persistently resentful, overwhelmed, or unable to bond with either child, reach out for support. Managing the needs of multiple young children is objectively hard, and struggling does not mean you are failing.

Your Action Plan

  1. Before the baby arrives: Read sibling-themed books together ("The New Baby" by Mercer Mayer, "I'm a Big Brother/Sister" by Joanna Cole). Visit friends with babies so your child can see what babies are actually like (small, loud, not great playmates yet).
  2. Make any big transitions (new room, new bed, starting preschool, potty training) well before or well after the baby arrives - at least 2-3 months in either direction. You do not want your child to associate these changes with being displaced by the baby.
  3. Create a "big sibling" gift from the baby - a small wrapped present waiting at the hospital or at home. This establishes the relationship as reciprocal from the start. Many families also keep small gifts on hand for when visitors bring gifts only for the baby.
  4. Protect one-on-one time with your older child. Even 15-20 minutes of undivided attention daily (reading together, playing their favorite game, going for a walk) provides reassurance that they are still important and loved. This is more impactful than any single conversation.
  5. Involve your older child in baby care at their level: fetching a diaper, singing to the baby, choosing the baby's outfit. Praise their helpfulness genuinely - "The baby calmed down when you sang! You are so good at that" - but do not force involvement if they are not interested.
  6. Respond to regression with patience, not punishment. If your potty-trained child has accidents, clean up matter-of-factly without shaming. If they want a bottle or pacifier, consider allowing it briefly - the novelty usually wears off quickly. Punishing regression increases anxiety and prolongs the behavior.
  7. Narrate the baby's perspective in a way that builds the older child's sense of importance: "Look, the baby is smiling at you! I think she loves her big brother." This helps the older child see themselves as valued by the new family member.
  8. Maintain existing routines as much as possible - bedtime routine, mealtimes, daycare schedule, weekend activities. Predictability is a powerful anxiety reducer for young children during times of change. See also: our checklist at /checklists/preparing-for-sibling for a comprehensive preparation timeline.

Sources

AMERICAN ACADEMY OF PEDIATRICS

Preparing Your Child for a New Sibling. HealthyChildren.org.

ZERO TO THREE

Preparing Your Child for the Arrival of a New Baby. Zero to Three.

AMERICAN ACADEMY OF PEDIATRICS

Shelov SP, et al. Caring for Your Baby and Young Child: Birth to Age 5. 7th ed. American Academy of Pediatrics; 2019.