Two people, one baby, and no shared memory at 3 a.m. The feeds are hard, but the coordination is what wears a couple down. Every wake-up starts with the same handful of questions, and the only person who knows the answers is asleep.
Plenty of parents try to fix this with a shared note, a whiteboard on the fridge, or an actual spreadsheet. It holds for about ten days. Here is what tends to survive longer.
Protect one stretch each, not fairness by the hour
Two shapes work for most couples. Split shifts: one parent owns roughly 9 p.m. to 2 a.m., the other owns 2 a.m. to 7 a.m. Alternating nights: one parent takes the whole night, the other takes the next one.
Split shifts give both of you a four or five hour block of uninterrupted sleep, every night. Alternating nights give one of you a full night and hand the other a wrecked one. If you both work, or if one of you is still recovering from the birth, split shifts are usually the kinder version. Alternating nights make more sense when one parent is on leave and the other is not.
Either way, the thing you are protecting is one unbroken stretch each. Not an equal number of wake-ups. Sleep does not divide evenly the way hours do.
The handover is four facts
Whoever takes over needs to know four things. When the last feed ended. How much, or which side. When the last diaper change was. Whether the baby went down easily or fought it.
That is the whole handover. If those four live in one shared record that both of you can open, nobody has to be woken up to be asked. That is the real reason to share a log rather than trade messages: the answer is already there at 4 a.m., without a whispered conversation. In Little Bean both parents write to the same timeline, and Standard covers the two of you. If a grandparent or a nanny is also logging, that is what Family is for.
Why the spreadsheet stops getting filled in
Not because spreadsheets are bad. Because the cost of one entry at 3 a.m. is too high. Unlock the phone, find the tab, scroll to the right row, type the time, tab across, type the amount. Six actions while holding a baby in your other arm. You will manage it for a week, then you will start skipping the ones you think you will remember.
A log with holes in it is worse than no log, because you stop trusting it, and an untrusted log gets abandoned. The fix is not more discipline in the dark. It is making an entry cost one tap.
Decide the rules at 8 p.m., not at 3 a.m.
Five minutes in daylight saves an argument in the dark.
Who has which half tonight. Say it out loud. Assumptions do not survive sleep deprivation.
Who moves first. If you are both asleep when the baby wakes, one of you is the default. Otherwise you both lie there waiting for the other one to move.
What counts as wake me. Agree in advance on the few situations where the off-duty parent gets woken. Most nights it will be none of them.
Where the kit lives. Bottles, muslins, a clean sleepsuit, all in one place. This sounds trivial until you are looking for it in a dark kitchen.
When the split is not 50/50
If you are breastfeeding and not pumping, the feeds themselves are not splittable, and pretending otherwise leaves both of you feeling short-changed. The split is then about everything around the feed: the change, the resettle, bringing the baby over and taking them back, and the early morning shift so the feeding parent gets one extra hour at the end of the night. Divide the work that can be divided, and say plainly that this is what you are doing.
What a week of the log actually shows you
Once seven nights are in, two things become readable.
The first is where the longest stretch lands. If it straddles your handover, you are both getting chopped in half. Move the handover by an hour and you each sleep better for nothing.
The second is whether a particular wake-up is hunger or habit. A feed that is consistently tiny at the same hour reads differently from one that empties a bottle. That is a useful thing to raise at your next check-up, rather than something to solve alone at 4 a.m.
And if your evenings look like a run of short feeds stacked on top of each other, that is very likely the normal pattern described in cluster feeding, explained. Worth reading before you redesign the whole night around it.
The goal here is not a perfect system. It is that neither of you has to hold the night in your head, and that the person going back to sleep can actually go back to sleep.
If night feeds change suddenly, if your baby becomes hard to wake or feeds far less than usual, or if you are worried about how either of you is coping, call your midwife, health visitor or doctor. A shared log helps you notice early; a professional is the person to act on it. Nothing here is medical advice.
One short note, once a month.
A single practical piece for the stage your baby is in. No drip campaigns, no upsells.