The effort of pumping is one of the four factors most strongly associated with stopping breastfeeding before you want to [1]. Returning to work is where that effort peaks. There are three workable patterns; the right one depends on your job, your childcare, and how much you want to pump.
Express at the times your baby would feed — for most babies over three months, every three to four hours. Expressing releases prolactin, which stimulates milk production [2], so keeping to the same times each day maintains supply. Childcare gives your expressed milk from bottles; you breastfeed morning, evening and overnight.
Practicalities: a double electric pump halves session time; a hands-free bra lets you work while pumping; milk keeps in a cool bag with ice packs for the journey home. Your employer's obligations to provide breaks and a private space vary by country and state — check yours.
If pumping at work is impossible or you simply do not want to, give formula at the working-day feeds and keep the breastfeeds at home. Your supply will settle to the feeds you keep [4]. WIC's advice for this route is to "exclusively breastfeed … for as long as possible during your maternity leave" before starting to combine, so supply is well established first [4].
Introduce the formula feeds gradually in the two weeks before you return, one feed at a time, so your body adjusts and your baby learns the bottle — see how to start combination feeding.
Pump once at work — lunchtime, say — and give formula for the other work-hours feed. This keeps a midday supply signal without the full pumping schedule.
Give childcare written instructions. For formula: use within two hours of preparation and within one hour of starting a feed, discard leftovers, refrigerate unused bottles immediately and use within 24 hours [3]. For expressed breast milk, follow your national guidance on storage times, label every bottle with date and time, and ask that unfinished expressed milk is not re-warmed.
The morning breastfeed is usually the fullest; keep it. Breastfeed as soon as you get home, before anything else. Keep night feeds as breastfeeds if you can bear to — they matter for supply — and if you cannot, make the night bottle the same one every night rather than alternating.
If supply drops anyway, add a short pumping session in the morning after the first feed and see low milk supply.
Yes, in one of three ways: express at work and send that milk to childcare; give formula at work-hours feeds and breastfeed morning, evening and night; or a mix. The pattern that keeps the most supply is the one where you remove milk at the same times every day.
Roughly as often as your baby would feed — every three to four hours for an older baby. Expressing releases prolactin, which maintains production. Skipping sessions for a few days signals your body to make less at those times.
No. Many parents give formula during the working day and breastfeed at home. Supply settles to the feeds you keep. WIC's advice is to breastfeed exclusively for as long as possible during leave, then combine.