The first weeks after a separation are the hardest time to make good decisions — and the time you’re asked to make the most of them.
Everything is raw, nothing is settled, and the children are watching how the adults handle it. It’s tempting to try to sort everything at once, or to put off sorting anything because it all feels too big. Neither works. What helps is knowing the handful of things that genuinely matter first — and letting the rest wait.
How do you start co-parenting after separation? Start small and in order: steady the children’s routine, agree how and where you’ll communicate, write down a simple parenting plan, set a few ground rules for the adults, and make sure each home has what the children need. Get those basics running before you tackle anything bigger — and aim for calm, not perfect.
That word — calm — matters more than it sounds.
Why a calm start matters more than a perfect one
Here’s the most important thing to know going in, and it takes the pressure off: it isn’t separation itself that harms children — it’s conflict. The UK’s Early Intervention Foundation, with Professor Gordon Harold of the University of Sussex (in work commissioned by the Department for Work and Pensions), found that frequent, intense and poorly-resolved conflict between parents — whether they’re together or apart — is what puts children’s mental health and long-term outcomes at risk. It’s the relationship behaviour, not the relationship status.
That’s genuinely good news for the first 90 days. You don’t have to get back together, become friends, or build a flawless arrangement. You have to get the conflict down and keep it down. Everything below is in service of that one goal.
First, steady the children’s routine
Children cope through predictability. What unsettles them most isn’t that there are now two homes — it’s not knowing when they’ll next see each parent. CAFCASS puts it plainly: children worry when there are gaps with no explanation.
So the first practical job is a routine the children can count on: which days are with which parent, how handovers happen, who does the school run. It doesn’t have to be the final arrangement — it has to be knowable. Younger children usually suit “little and often”; older ones can manage longer stretches. Put the routine somewhere both homes can see it, not in one parent’s head, so a changed week is a quick update rather than an argument. (A shared calendar both parents see is the simplest way to make “what’s happening this week” stop being a question.)
Agree how — and where — you’ll communicate
Decide early how the two of you will talk about the children: which channel, how quickly you’ll reply, what counts as an emergency. Settling this in the first weeks prevents months of friction.
The habit that works is business-like: brief, factual, child-focused, one topic at a time, and never through the children. You’re not aiming for warmth you don’t feel — you’re aiming for a working relationship that runs on logistics, not history. If talking to your ex is hard (it usually is at first), our guide to co-parenting communication covers exactly how, including with a high-conflict ex.
Write down a simple parenting plan
The single biggest thing you can do to lower conflict early is to get the arrangement out of your heads and onto paper. A parenting plan is just a written record of what you’ve agreed: living arrangements and contact, who’s responsible for documents and appointments, how you’ll handle school, holidays, clothing and the day-to-day money. Writing it down means “I never agreed to that” stops being a recurring fight.
You don’t need a solicitor to start one — CAFCASS offers a free template, and so do we: a free UK parenting-plan template you can fill in and keep living in one place. A parenting plan is not a court order and isn’t automatically legally binding — it’s an agreement between you. If you need a legally binding arrangement, that’s a separate, formal route; GOV.UK’s guidance on making child arrangements when you divorce or separate is the place to start (this post deliberately stays out of the legal detail).
Set a few ground rules for the adults
A short list of agreed adult behaviours protects the children more than almost anything else:
- Don’t criticise the other parent in front of, or to, the children.
- Don’t quiz them about the other home, or about a new partner.
- Don’t use them as messengers — adult messages go adult-to-adult.
- Keep adult disagreements away from little ears.
These aren’t about being the bigger person for its own sake. They’re the practical mechanics of “keep the conflict down” — the one thing the evidence says matters most.
Make each home feel like home
Small practical things ease the transition: essentials at both houses so children aren’t living out of a bag, a comfort item that travels with them, and making sure school and the GP have both parents’ contact details. Ask the children what would help — they often have simple, sensible answers the adults miss.
Sort the money basics early — without making it a battleground
Money is one of the fastest routes to conflict, so handle the basics early and keep them visible. Child maintenance is its own thing — there’s a formal UK route via the Child Maintenance Service (signposted on GOV.UK), separate from the everyday and one-off costs of two homes. For those shared costs, agree who covers what, and log them in one place so “you owe me for the school trip” becomes a glance, not a row. (That’s what shared expenses is for.)
Go easy — the first 90 days are for stabilising, not perfecting
You will not get this fully right in three months, and you’re not meant to. The first 90 days are for building a calm baseline: a routine the children trust, communication that doesn’t combust, the arrangement written down, and the temperature low. That’s success at this stage.
If you’re stuck on a specific decision, family mediation (signposted on GOV.UK) is built for exactly that. And if you’re struggling personally, that’s normal and worth support — a service like Family Lives, or Place2Be for the children, can help. App habits and routines aren’t the answer to abuse or fear: if contact feels unsafe, reach out to a support service, and if you’re ever in danger, contact the police.
Start with the routine. Get it written down. Keep it calm. The rest you can build from there.