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What Adjustments Can Support Exercise While Breastfeeding?

by Samaira Farid,
Dr Shree Datta
Medically reviewed by Dr Shree Datta
Pensive young lady sitting outside with a journal on her lap and a pen in her hand
Bloume content relating to health, wellbeing and nutrition has been reviewed and validated by relevant medical professionals in the UK, based on UK guidelines and practices applicable at the time of publication. Recommendations in other localities may differ from those found on our site and you should always seek the guidance or advice of relevant healthcare professionals in your area.

If you are breastfeeding and thinking about getting back to movement, you might already know the feeling of full breasts mid-session, or the low-level tiredness that makes even a short walk feel like a negotiation. Knowing what to expect with exercise while breastfeeding is less about restrictions and more about a few simple adjustments that make movement feel far more manageable. If you've had a straightforward birth, gentle activity like walking, light stretches, and pelvic floor exercises can start as soon as you feel ready, though it helps to wait until after your six-week postnatal check before going back to anything high-impact. If your birth was more complicated, involved a caesarean, or you had a perineal injury, talk to your midwife, health visitor, or GP before increasing your activity.5

Moving your body can support your recovery in a few ways. It can lift your energy, help you relax, and may lower the chance of postnatal depression. It does not replace professional mental health support, though it is a genuinely useful tool alongside it. Pregnancy hormones can also leave your ligaments and joints looser for six months or more after birth, which raises the risk of injury if you do too much too soon. Easing back in gradually is the approach most likely to keep you moving consistently.6

Breast support during exercise

Your back and cup size have likely changed since before pregnancy, so an old sports bra may no longer give you enough support. Getting measured for a new one is a practical first step before going back to anything with bouncing or impact. A well-fitted, supportive bra matters even more when you are breastfeeding.7

Full breasts can feel uncomfortable when you move. Alongside a well-fitted bra, clothing that does not press on the breast tissue can help. You might find layering a supportive crop top under a looser top works well. These are comfort-led choices rather than clinical rules, though they can make a real difference to how a session feels.1

Staying hydrated when you are active and breastfeeding

When you are breastfeeding and moving, thirst can creep up faster than usual. Breastfeeding raises your fluid needs, and physical activity adds to that. Around 6 to 8 glasses of fluid a day is a reasonable baseline, and you will likely need more on top when you are exercising or feeding. Keeping a drink nearby during a session, and sipping before and after, is a simple habit that supports your hydration and your milk supply. Water is the most practical choice.8

Timing feeds around exercise

You may find it more comfortable to feed or express before you exercise rather than after. This eases the heaviness of full breasts during movement and can make the session feel more manageable. It is a comfort-led approach rather than a clinical rule, and it is one of the adjustments people tend to mention most.9

If you are exercising with your baby, at a buggy fitness class for example, it makes sense to leave a short gap after a feed before you start, so your baby's stomach has time to settle. The right amount of time varies, so follow your baby's cues and use your judgement.10

Intensity, milk supply and what the evidence shows

Regular, moderate exercise, like a brisk 30-minute daily walk, does not change the quality or quantity of your breast milk.11

Mild or moderate exercise does not raise lactic acid levels in your milk. Very hard exercise can lift it for a short while, which may change the taste of your milk slightly, though there is no sign this harms your baby. If your baby seems fussy after a high-intensity session, a quick rinse of your skin before feeding may help, since the salty taste of sweat can add to fussiness too. This comes from the available evidence rather than a UK clinical body, and your own experience may differ.2

Pelvic floor considerations throughout the postnatal period

Pelvic floor exercises matter through your postnatal recovery, whether or not you are breastfeeding. You can start them within the first few hours after birth, once any catheter has been removed, and keep them up regularly. You should also be given information about pelvic floor exercises and how they help prevent leaks and prolapse, where the pelvic organs lose some of their usual support.312

High-impact activities where both feet leave the ground at once, like running or jumping, are worth easing back into gradually, once lower-impact movement feels comfortable. If you notice any of the following during or after exercise, stop and speak to your GP or a women's health physiotherapist:13

  • A feeling of heaviness or pressure in the vagina
  • Any leaking of urine
  • Any leaking of faeces14

If you are not sure where to start with pelvic floor exercises, or you want guidance shaped around your birth, asking your GP for a referral to a women's health physiotherapist is a good next step.4

Frequently Asked Questions

Sources

  • [1] Keeping fit and healthy with a baby

    Wearing a supportive, well-fitted sports bra and non-restrictive clothing to manage changes in breast size and prevent discomfort during exercise while breastfeeding

  • [2] Keeping fit and healthy with a baby

    Regular moderate exercise, such as a brisk daily 30-minute walk, does not affect the quality or volume of breast milk or harm your baby.

  • [3] RCOG — Your pelvic floor

    Starting pelvic floor muscle exercises within the first few hours after birth (once any catheter is removed) to support recovery and reduce the risk of urinary incontinence and pelvic organ prolapse

  • [4] NHS — Your post-pregnancy body

    NHS (Your post-pregnancy body): Advises contacting a GP or requesting a referral to a specialist women's health physiotherapist if you experience pelvic floor dysfunction, pain, or need guided recovery support.

  • [5] Keeping fit and healthy with a baby

    Gentle exercise like walking, gentle stretches, and pelvic floor exercises can be started as soon as you feel ready after a straightforward birth, though it is worth waiting until after your six-week postnatal check before returning to anything high-impact.

  • [6] Advice & Guidance for Exercise in the Childbearing Years

    Hormonal changes from pregnancy can affect ligaments and joints for six months or more after birth, increasing the risk of injury if you do too much too soon.

  • [7] Advice & Guidance for Exercise in the Childbearing Years

    A well-fitted, supportive bra is particularly important when you are breastfeeding, and this is reflected in guidance from specialist postnatal physiotherapy practice.

  • [8] Water, drinks and hydration - NHS

    Aiming for around 6 to 8 glasses of fluid a day is a reasonable baseline, and you are likely to need more when exercising or breastfeeding.

  • [9] Exercise and breastfeeding

    Many people find it more comfortable to feed or express before exercising rather than afterwards, to reduce the physical heaviness during movement.

  • [10] Breastfeeding Network - Breastfeeding and Exercise

    If you are exercising with your baby, it is sensible to allow a short gap after a feed before starting, to give your baby's stomach time to settle.

  • [11] Keeping fit and healthy with a baby

    Regular, moderate exercise such as a brisk 30-minute daily walk does not affect the quality or quantity of breast milk.

  • [12] Fit for the Future

    Guidance from specialist postnatal physiotherapy recommends starting pelvic floor exercises within the first few hours after birth, once any catheter has been removed, and continuing them regularly.

  • [13] Advice & Guidance for Exercise in the Childbearing Years

    High-impact activities where both feet leave the ground at once, such as running or jumping, should be returned to gradually.

  • [14] Advice & Guidance for Exercise in the Childbearing Years

    You should stop exercising and seek advice from a GP or specialist physiotherapist if you experience heaviness in the vagina or any urinary or faecal leakage.