It's the third night home. The baby is asleep, finally, on someone's chest. You're sitting on the floor of the kitchen with a cup of tea you forgot was hot. You open the banking app. The number is the number. Everything around it is different.
The balance hasn't changed yet
For the first month or so, the bank account looks oddly normal. Salary still lands on payday. Rent still goes out on the first. The big one-time spends — the hospital bill, the cot, the car seat — show up as a single line and then they're done.
The change isn't in any of those. The change is in the new recurring lines that haven't happened yet, but will start showing up month after month, ongoing. Diapers. Formula or feeding accessories. The paediatrician's monthly check-up. The increased insurance premium. Eventually daycare, which is the line that quietly redraws everything.
Most budgeting apps don't tell you about any of this, because they can only see what's already happened. They look at your last month's spending and call it your budget. The first kid's first month doesn't look like the second month. The second month doesn't look like the sixth.
The well-meaning advice doesn't quite land
People will tell you "babies are cheaper than you think." They are and they aren't. The diapers are cheaper than you think. The daycare is exactly as expensive as everyone said it would be, and for some reason it still surprises everyone.
People will also tell you "don't worry about money, just enjoy this time." This is good advice for the first two weeks and very bad advice for the first two years. Worrying about money is a useful activity if it leads to seeing money clearly. The point isn't to stop worrying. The point is to worry about the right number and stop worrying about the wrong ones.
The right number is the new normal
Not last month. Not last year. The shape of the next twelve months with these new recurring lines added in.
You don't need to be precise. You're not going to be precise — half the spend you can predict, half is going to be surprising (paediatrician visits at 11pm on a Sunday). What you need is a rough timeline that's roughly right instead of a balance that's exactly meaningless.
What changes the timeline
The new lines, mostly. In Marvin Money you add them as recurring bills on the timeline — even if you don't know the exact amount yet. Estimate high. You can correct later.
Here's a list, by rough order of impact:
- Daycare or childcare. The biggest line. If you're returning to work, this is the one that reshapes everything. Add it on the timeline starting the month it'll begin, even if that's six months away.
- Diapers and feeding. Smaller individual hits, but every month, for years. Add a single recurring line and trust the average.
- Health insurance change. Most plans cost more when you add a dependent. Update the recurring premium on the timeline the month the new amount kicks in.
- Increased grocery spend. You won't notice this for the first few months. By month four, the household food line goes up by a measurable amount.
- Subscriptions you'll quietly stop using. Gym, the meal-kit box, the wine-of-the-month club. Some of these stop on their own. The rest are easy wins to cancel.
- Eventually: school fees, activities, the everything else. These come later. Don't model them yet. You have time.
Once those new lines are on the timeline — and your salary payday lines are still landing on their usual dates — the forecast updates. The number for the end of next month is different. The number for the end of the year is different. The shape of the next twelve months is different.
You will not love the new shape. That's fine. The point isn't to love it. The point is to see it.
What seeing it actually does
Most decisions you'll make in the next year are small. Whether to renew the cleaning service. Whether to keep the second car. Whether to take the slightly cheaper holiday. Whether to negotiate on daycare. Whether to ask for a raise this cycle or wait one more.
Each of these is easier with a real timeline. Not because the timeline gives you the answer. Because the timeline shows you the consequences of either answer, and you can pick the one you can live with.
If today is your third night
Five minutes, this week:
- Open Marvin chat. Tell it what's new. "We just had a baby. Add daycare estimate $1,800/month starting in October, diapers $80/month, paediatrician $120/month, insurance bump $90/month." Marvin drops each line onto the timeline as a recurring bill.
- Ask Marvin what the next twelve months look like. "Where's my balance sitting in six months? In a year?" Marvin shows you the projected number for that month. That's the number to plan around — not today's balance.
- Ask Marvin to list every recurring subscription you're paying for. "Show me everything I'm paying monthly." The list usually surfaces two or three you no longer use since the baby came — the gym you haven't been to, the meal kit you cancelled mentally but not actually, the streaming service nobody watches. You decide which ones to cut; Marvin updates the timeline.
- Have one conversation with your partner that uses real numbers. Not "we should be careful." Real numbers. Marvin's timeline gives you the vocabulary.
Prefer to do it on the timeline directly? Add the new recurring bills yourself — the form takes twenty seconds per line — and scroll forward to read the forecast. Same answers, more taps. Marvin's chat is the shortcut, not the only way.
That's it. The hard part of the first year isn't the money. It's everything else. But the money will quietly take more of you than it should if you don't sit down once and look at the new shape. Once you've looked, it gets out of the way.
For the bigger known expense further down the road, see eighteen months before the admission letter. For when the income side breaks, see when the job ends on a Tuesday.