A week by week guide to what’s happening to you and your baby

WHAT'S HAPPENING WITH YOU

Welcome to your third trimester. Aches and pains may become irritating as your uterus grows and the joints of the pelvis begin to loosen in preparation for delivery. It's easy to acquire back problems if you allow yourself to slump when sitting or standing. Don't stop exercising. Walking (or swimming) is important and can make you feel more energetic. Exercises designed for strengthening the abdominal muscles, which support the back, can help. After the fourth month of pregnancy, you should avoid exercising while lying on your back. You can probably start your maternity leave now if you wish. You have to use the due-date on your MAT B1 certificate that your midwife or GP will give you. Need more information? Contact the Maternity Alliance Advice line on 020 7588 8582.

WHAT'S HAPPENING WITH YOUR BABY

Your baby now weighs two pounds, nine ounces and is 13 1/2 inches long. The crown-to-rump measurement, which may be slightly more accurate than length estimates, is about 26cm. Your baby's lungs have now developed to the point where he or she could breathe air well.

HEALTHY EATING

Running out of ideas for snack foods? Try these:
Slices of wholemeal bread dried in the oven
Water crackers and cottage cheese
Carbonated water with a slice of lemon or lime
Crisp green apples
Slice of fruit cake
Muesli bars
Fruit sorbet
Nuts and raisins
Peas in the pod

FACT OF THE WEEK

Pethidine - For decades this painkilling drug has been given to women in labour. It is given by injection into a muscle, usually in the thigh. Midwives are able to give pethidine so there should be very little delay in getting it. It generally takes effect within 15 to 20 minutes and lasts three to four hours.

Find out what to expect in week 30 of your pregnancy.

For a list of all the pregnancy week by week articles click here