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How to remember which side you breastfed on last

Published 1 October 2026 · Dao Van Thuong · 5 min read

Four hours after the last feed, at the end of a long night, the question comes up again: which side was it? It is one of the most common things breastfeeding parents forget, and it is not a sign of anything except being very tired.

Many lactation consultants suggest starting each feed on the side the baby finished on, or on the side that feels fuller, so both breasts are emptied and stimulated over the day. Your midwife or lactation consultant may give you different advice for your situation — follow theirs. Either way, you need a way to remember. Here are the methods that work, from zero-effort to fully logged.

This guide is general information, not medical advice. Follow what your doctor, midwife or health visitor told you, and call emergency services in an emergency.

First, decide what you are tracking

The tricks below only help if you know what they mean. Pick one rule and stick to it:

  • Track the side to start on next time. This is the simplest: whatever the marker says is where you begin.
  • Or track the side you started on this time, and begin on the other one next time.

Tell your partner which rule you use, so they can answer the question for you when you ask at 4 AM.

Physical reminders that take no effort

  • A hair tie or soft bracelet on your wrist. Wear it on the side you will feed from next and move it when you switch. It is the most popular method because you can feel it in the dark without looking.
  • A safety pin, ribbon or clip on your bra strap. Move it to the side to start on next time. Nursing bras with a clip on each strap make this easy.
  • The nursing pillow or a cushion. If you always feed in the same chair, leave a cushion on the side to start on next.
  • A phone or water bottle placed on that side of the bed or table.

The weakness of all these is that they hold one bit of information. They will not tell you when the last feed was or how long it lasted, and they are easy to knock off or forget to move.

Listen to your body

If you have lost track entirely, gently feel both breasts. The one that feels fuller or firmer has usually gone longer without being emptied, and is a reasonable place to start.

This works better once your supply has settled, and less well in the very first days or when you have been pumping. It is a fallback, not a system.

A one-line log

If you also need to know the time of the last feed — and in the first weeks, you usually do — write one line per feed on a sheet of paper next to where you feed:

  1. 1The start time.
  2. 2The side you started on, and the side you finished on if you switched (for example 'L→R').
  3. 3Roughly how many minutes, if your care team has asked about it.

That is enough to answer 'which side' and 'when' at a glance, and it gives your midwife or doctor something concrete to look at if feeding is not going smoothly.

A note on your phone works the same way, but opening it at night means bright light. Turn the screen brightness right down, or use a dim, warm night mode if your phone or app has one.

Night feeds: make it automatic

  • Put the marker or the paper within arm's reach of where you feed, before you go to sleep.
  • Move the hair tie or write the line at the start of the feed, while you are awake enough. At the end you may fall asleep.
  • Keep a small light you can switch on with one hand.
  • If the baby falls asleep after one side, note that too. Next time you will probably want to start on the other side.

Pumping and bottles count too

If you pump one side, or your partner gives a bottle of expressed milk while you rest, it changes which side feels fuller. Note pumping sessions in the same place as feeds so the picture stays complete.

If someone else gives a bottle, ask them to write the time and amount in the same log. Otherwise the next breastfeed may come at an unexpected time and the side you expected to start on will not feel the way you expect.

How a partner can help

Your partner cannot feed for you, but they can be your memory. Agreeing that they move the hair tie, write the log line or check the time when the baby latches takes one task off your plate. When they take a night bottle, they log it in the same place.

Where Baton helps

Baton's breastfeeding timer records each side separately: you can switch sides, pause and stop, and it keeps the minutes for each. The next time you open the app, the Today screen tells you which side is next and how long ago the last feed was.

The timer also runs on the Lock Screen and the Dynamic Island, with buttons to switch sides, pause or stop without unlocking the phone. If you forgot to start it, you can start the feed up to 30 minutes ago.

If your partner uses Baton too, through their own iCloud account, they see the same timer and the same next side on their phone. Night mode uses warm, dim colours with no bright white. The timer and partner sync are part of the free features.