Hot weather and high body temperature during pregnancy

Some mums-to-be find being pregnant in hot weather challenging. It’s important to take it easy and stay cool when pregnant. This is especially true during a heatwave when there is a greater risk of dehydration, heat exhaustion and heatstroke.

Rachel Heathcock, NCT Antenatal Teacher, offers her tips to pregnant women on keeping cool in the hot weather, in this video.

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Do you get hotter during pregnancy?

Many women say they feel hotter during pregnancy. But there is limited evidence to suggest pregnant women’s core body temperature is actually any higher than usual because of pregnancy (Jones et al, 1985; Clapp, 1991; Lindqvist et al 2003).

Yet warmer weather can certainly make pregnant women feel more hot and uncomfortable (Jones et al, 1985; Raines, 2018). Hot weather can also lead to dehydration, fatigue, heat exhaustion, fainting or even heatstroke (NHS Choices, 2018a). So it’s really important to keep cool when pregnant.

Avoid over-exerting yourself

If a pregnant woman’s body temperature rises above 39.2°C in the first 12 weeks of pregnancy, the baby has a slightly increased risk of having a birth defect (Moretti et al, 2005; RCOG, 2006). Don’t worry though, a woman’s body temperature wouldn’t typically be so high without a fever or exercising in a very hot and humid climate before acclimatising.

It’s therefore best to avoid overexerting yourself, particularly in the first trimester of pregnancy (RCOG, 2006). If there is a sudden heatwave and it’s very hot and humid, you will need to take it easy and avoid exercising. That is, until you’ve got used to the heat, which might take a few days.

Use water to cool down

Having a cool bath during a heatwave can help you to feel less hot and bothered. If you are having a bath, the water temperature shouldn’t be above 32°C.

If you’re going out or exercising in warm weather, take water to stay hydrated. You could also carry a water spray in your bag so you can spray yourself with some cold water to cool off quickly.

Another top tip is putting your wrists under cold running water or pouring a little water from your bottle over them.

Protect your skin

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Avoiding the sun can help prevent melasma also called pregnancy mask. Melasma is a common skin condition in which brown or grayish patches of pigmentation develop (British Association of Dermatologists, 2018). It usually develops on the face.

This condition is more common in women, especially during pregnancy. Up to 50% of women may be affected (British Association of Dermatologists, 2018).

One of the most important things to prevent melasma worsening is protecting yourself from UV radiation. You can do this by avoiding the sun, wearing a wide-brimmed hat when you are outside and by wearing sun tan lotion factor 30 or above, with a high UVA rating (British Association of Dermatologists, 2018).

Easing discomfort of swollen ankles

Ankles, feet and fingers can swell in pregnancy, as your body retains more water than usual. It’s often worse during hot weather, at the end of the day and further into your pregnancy (NHS Choices, 2018c).

Throughout the day, the extra water tends to gather in the lowest parts of the body, especially if the weather is hot or you’ve been standing a lot (NHS Choices, 2018c). The pressure of your growing womb can also affect the blood flow in your legs, which can cause fluid to build up in your legs, ankles, and feet (NHS Choices, 2018c).

If you do have swollen ankles, you could try the following:

• Avoid standing up for a long time.
• Wear comfortable shoes and socks – anything with tight straps might pinch.
• Try to rest with your feet up as much as you can.
• Drink plenty of water – this helps your body get rid of excess water.
• Try to take regular walks during the day or doing foot exercises (when sitting or standing), which can improve blood circulation, reduce swelling in the ankles, and prevent cramp in the calf muscles. You could bend and stretch your foot up and down or rotate each foot in a circle.

(NHS Choices, 2018c)

If you are pregnant and experience a sudden swelling of your face, hand or feet, and a severe headache, contact your midwife, GP or NHS 111 straight away, as these could be signs of pre-eclampsia (NHS Choices, 2018c).

Know the signs of heat exhaustion and heat stroke

During hot weather, it’s useful to know the signs of heat exhaustion or heat stroke. The symptoms of heat exhaustion include:

• dizziness and confusion
• loss of appetite and feeling sick
• excessive sweating and pale
• clammy skin
• cramps in arms, legs, and stomach
• fast breathing and pulse
• temperature of 38 degrees or above
• intense thirst.

(NHS Choices, 2018b)

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If someone shows signs of heat exhaustion, they need to be cooled down. Move them into a cool place in the shade or indoors and get them to lie down with their feet up. They should drink water to rehydrate. Cool them with a fan or cool water spray. They should start to feel better or cool down within 30 minutes (NHS Choices, 2018b).

Heatstroke is a medical emergency. Call 999 if the person:

(NHS Choices, 2018b)

By taking sensible steps, you can hopefully enjoy some of the hot weather without feeling too uncomfortable.

This page was last reviewed in April 2018

Further information

Our support line offers practical and emotional support with feeding your baby and general enquiries for parents, members and volunteers: 0300 330 0700.

We also offer antenatal courses which are a great way to find out more about birth, labour and life with a new baby.

Make friends with other parents-to-be and new parents in your local area for support and friendship by seeing what NCT activities are happening nearby.

The British Red Cross have useful information about coping in the heat.

Read more about heat exhaustion and heat stroke from NHS Choices.

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