If your asthma is well controlled, asthma problems during your pregnancy are unlikely. Some women find that their asthma improves, and some remain unchanged. Those whose asthma does get a little worse can be helped with good asthma management; you need to consult with your doctor regularly. Here are the most important points to remember. 

• It is common to experience some breathlessness near the end of your pregnancy - this is related to the size of the baby and the pressure it puts on your diaphragm. A normal delivery is usual. If you have severe asthma, your doctor will discuss caesarian section delivery with you. The rate of caesarians among women with asthma is no higher than in those without it. 
• Medications for asthma have been shown to be extremely safe for both the mother and the developing baby. It is more dangerous to have untreated asthma during pregnancy than to continue with your prescribed asthma medications. Asthma symptoms may reduce the amount of oxygen available to the baby. Follow your Asthma Action Plan very carefully for the best asthma control. 
• Although asthma medications do enter breast milk, the concentrations are usually extremely small and do not have any adverse effect on the baby. Your doctor can advise you on breastfeeding. 
• If there is a strong history of allergic illness in your family, you should discuss this with your doctor. Extra care may be needed to avoid triggering asthma attacks. For example, if you have a possible food allergy, you may have to watch what foods you eat. You may need to deal with suspected allergens in your home, such as indoor pets, house dust mites in soft furnishings and carpets, or particular plants in the garden. They can influence the probability of your baby developing persistent wheezing. Your doctor can give you an information sheet and advice on allergens and other asthma triggers. 
• Cigarette smoking should be avoided during your pregnancy. It increases the chances of wheezing in the newborn, as well as having other harmful effects. Ask your doctor and/or pharmacist to help you give up or reduce your smoking, or the smoking of those around you. 
• You need to monitor your peak flow and visit your doctor regularly. Your doctor will make sure your asthma is being well managed.

For more information and support, contact your local Asthma Foundation on 1800 645 130.

Content Updated 6 June 2002