Breastfeeding While Pregnant and Tandem Feeding

Is it safe to carry on?

The general answer from breastfeeding organisations is yes. La Leche League GB states that "research tells us there's usually no reason why a mother shouldn't breastfeed while pregnant." The Australian Breastfeeding Association reaches the same conclusion, noting that for most mothers, breastfeeding during pregnancy does not affect the pregnancy or the birth weight of the new baby.

The theoretical concern is oxytocin. Breastfeeding releases it, and oxytocin causes uterine contractions. La Leche League GB addresses this directly: the amounts released are "usually not enough to cause the cervix to open before it is ready." The uterus also becomes progressively more responsive to oxytocin as pregnancy advances, which is why the caution is taken more seriously in a high-risk pregnancy than a straightforward one.

When caution genuinely applies

La Leche League GB is specific about the exceptions: "If you are expecting multiples or considered to be at risk for miscarriage/early delivery you may be advised to stop breastfeeding."

Speak to your midwife or obstetrician before deciding if you are carrying twins or more, if you have had a preterm birth previously, if you have a cervical stitch or a short cervix, if you have had bleeding in this pregnancy, or if you are getting regular contractions. This is a conversation with someone who knows your history, not a question a general page can answer.

Weight loss, persistent dizziness, or being unable to eat enough are also reasons to review it. La Leche League GB's position on nutrition is reassuring for most people — "You won't be depriving your unborn baby of nutrients by continuing to breastfeed so long as you eat reasonably well" — but that assumes you are managing to eat.

What changes, and roughly when

Three things reliably shift.

Supply falls. La Leche League GB puts the timing at "around the fourth or fifth month (sometimes before)", when "your milk production is likely to reduce due to pregnancy hormones." This is hormonal rather than demand-driven, so feeding more does not reverse it.

The milk itself changes. LLLGB notes "the composition of your milk will also change and become more similar to weaning milk" — moving back towards colostrum, and tasting different. Some toddlers object and wean themselves at this point. Others do not notice.

Nipples hurt. Pregnancy nipple tenderness is extremely common and is not a latch problem, so the usual latch fixes do not help much. La Leche League GB's suggestions are practical: "limiting nursing times, (eg to a few minutes or even a few sucks), ensuring a deep latch, distraction, and offering other snacks/liquids can all help."

Exhaustion is the fourth, unlisted change. Early pregnancy tiredness on top of feeding a toddler is genuinely hard, and it is a legitimate reason to reduce feeds.

If you decide to wean during pregnancy

Go gradually. Dropping one feed at a time over weeks avoids engorgement and gives your child time to adjust, and pregnancy is not a time to add mastitis to the list. Bedtime and early morning feeds are usually the last to go, and it is common for a child weaned during pregnancy to ask to feed again once the new baby arrives and milk is abundant.

Tandem feeding: what it actually involves

Tandem nursing is feeding a newborn and an older child at the same time — sometimes literally simultaneously, more often at different points in the day. The Australian Breastfeeding Association notes the underlying principle that makes it possible: the more milk your children take, the more your breasts produce.

The rule that matters in the first days is priority. The newborn feeds first and gets the colostrum. An older child who nurses vigorously can strip a breast in a way a newborn cannot, so until feeding is established, the baby goes first, every time.

Beyond that, most of the practicalities are ordinary. Oversupply and forceful let-down are common early on because two children are stimulating supply. An older child may help relieve engorgement. Positions for feeding both at once take experimentation — La Leche League GB's guidance on tandem nursing covers arrangements including feeding both at night, and notes it is possible but takes some working out.

Feelings are the part people are least prepared for. Aversion towards the older child during feeds is commonly reported, as is jealousy in the other direction. Neither is a sign that tandem feeding is wrong for you, but both are reasons to set limits on the older child's feeds if you need to.

Eating and drinking for three

Appetite and thirst both increase. La Leche League GB notes that calcium absorption improves during pregnancy, so extra supplementation is not needed unless dietary intake is low. Standard pregnancy supplement advice for your country still applies. If you are struggling to eat enough or losing weight, raise it at an antenatal appointment.

When to get help

Speak to your midwife or obstetrician if:

• You have bleeding, regular contractions, or cramping that continues after a feed.
• You are expecting multiples, or have had a preterm birth or late miscarriage before.
• You are losing weight, or cannot eat enough to keep up.

Ask a breastfeeding specialist if: nipple pain is unmanageable, you want to wean gradually and safely during pregnancy, or you want to plan how tandem feeding will work in the first weeks after the birth.

Where to get real help

In the UK the National Breastfeeding Helpline is 0300 100 0212, run by the Breastfeeding Network and the Association of Breastfeeding Mothers, and open every day of the year. La Leche League GB runs local groups and a helpline, and has specific material on pregnancy and tandem nursing. In Ireland the HSE offers an "Ask our breastfeeding expert" live chat and email service.