Preparing a Toddler for a New Baby | Gentle Sibling Transition Guide
Prepare your toddler for a new sibling: what to say, when to tell them, how to handle jealousy and regression, and building sibling connection. 9 FAQs.
A new baby is one of the biggest transitions your toddler will ever experience — bigger, in some ways, than it is for you. Some regression, clinginess, jealousy or bursts of aggression are normal, even in toddlers who seemed thrilled at first. The goal isn't to prevent every big feeling but to hold your toddler through it. This guide covers how to prepare gently, what to expect in the newborn weeks, and how to protect your bond with your first while welcoming your second.
When and how to tell your toddler
Toddlers under 3 don't have a strong sense of time — 'in 6 months' means nothing. Wait until you're comfortable sharing (usually second trimester), then use concrete markers: 'the baby will come when it's warm again' or 'after your birthday'.
- Keep language simple: 'There's a baby growing in mummy's tummy.'
- Read age-appropriate new-sibling books together (there are lots).
- Show them their own baby photos and tell them stories.
- Don't oversell — 'you'll have a new best friend!' can set them up for disappointment.
- Talk honestly: babies cry, need cuddles, can't play at first.
Practical prep before baby arrives
- Make any big transitions (new bed, potty training, daycare start, room change) at least 2–3 months before OR wait until several months after the birth.
- Practise the birth-day plan: who will look after your toddler, where, and when they'll see you.
- Pack a small 'when the baby comes' bag for them too.
- Consider a small gift 'from the baby' at the first meeting.
- Talk about what they can do when the baby arrives ('you can help pick a wrap').
- Prepare them for you being tired or in bed sometimes.
The first meeting and early weeks
Where possible, have someone else holding the baby when your toddler first walks in — so your arms are free for them. That first cuddle sets the tone.
- Let them approach the baby at their own pace.
- Involve them in gentle tasks: fetching a nappy, choosing an outfit, singing to the baby.
- Protect one-to-one time every day, even 10 minutes.
- Feed the baby with a snack and story ready for your toddler — feeds become special times together.
- Say the baby's feelings out loud: 'Baby loves it when you sing.'
Regression is normal
Sleep waking, potty accidents, wanting to be babied, refusing to feed themselves, tantrums, clinginess — all common in the first 6–12 weeks after a sibling arrives. It's your toddler saying 'do you still see me?'
- Respond with warmth, not correction.
- Meet the underlying need — connection — and the behaviour fades.
- Don't punish regressive behaviour; it's not defiance.
- Say what you see: 'You want to be my baby too. You always will be my baby.'
Jealousy and aggression toward the baby
Some toddlers hug too hard, try to sit on the baby, or hit. This is normal — but not allowed. Your job is to keep the baby safe and validate the feeling.
- Never leave a toddler unsupervised with a baby, even for a moment.
- Move quickly and calmly to block: 'I won't let you hurt the baby.'
- Name the feeling: 'You wish the baby wasn't here right now.'
- Offer a safe outlet: 'You can hit this pillow / squeeze this toy.'
- Reconnect afterwards with cuddles — behaviour, not love, is what changes.
Protecting your bond with your first
- Daily one-to-one time (even 10 min) is more powerful than long occasional outings.
- 'Special time' — child chooses the activity, no phones, full attention.
- Narrate your love out loud: 'I love being your mum.'
- Get partners, grandparents or trusted adults involved for baby care so you can be with your toddler.
- Small rituals — a bedtime song, a morning cuddle — become anchor points in the chaos.
Looking after yourself
Two under 5 is intense — physically, emotionally and mentally. Postnatal depression and anxiety are more common with subsequent children, not less. Watch how you're going and ask for help early — from your partner, family, MCH nurse, GP or PANDA (1300 726 306).
Common questions
When should I tell my toddler I'm having a baby?
Usually in the second trimester, around the time you'd tell close family. Toddlers under 3 have little sense of time, so anchor it to something they'll recognise ('when it's warm', 'after your birthday').
Should I move my toddler out of the cot before the baby arrives?
Only if you can do it 2–3+ months before the birth, so it doesn't feel like the baby pushed them out. Otherwise wait until several months after. See our transitioning-to-a-toddler-bed guide.
My toddler keeps hitting the baby — what do I do?
Move calmly, block the action, name the feeling ('you wish the baby wasn't here'), and give a safe outlet. Never leave them unsupervised. This is normal early-sibling behaviour and it passes with connection and consistent limits.
My toddler is regressing — is that a bad sign?
No. Some regression (sleep, toileting, wanting to be babied) is one of the most common toddler responses to a sibling. It usually settles within 6–12 weeks with warm, low-pressure responses.
How do I breastfeed a newborn with a toddler running around?
Set up a 'feeding basket' with a snack, drink, favourite books and simple toys just for feeds. Screens can be used occasionally without guilt in the newborn survival weeks.
Should I feel guilty about splitting my attention?
No — but it's normal to. Your toddler will benefit for life from having a sibling. Small daily one-to-one moments (even 10 min) matter far more than big outings.
How do I handle daycare drop-off when I'm heavily pregnant or postpartum?
Keep the routine as stable as possible, give a predictable goodbye, and get partners or grandparents to help with drop-offs while you recover. See our separation-anxiety guide.
What age gap is 'best'?
There's no evidence for one 'right' age gap. Each gap has trade-offs and every family works it out. What matters far more is warmth, one-to-one time and how the transition is handled.