The amount of weight you gain during pregnancy will depend on what you weighed before you became pregnant. Ask your midwife or dietitian to calculate your body mass index (BMI) to help you work out approximately how much weight you should gain. Remember this is only an estimation, all women are different and all pregnancies are different so please speak with your practitioner if you have any concerns regarding your weight.
|If your pre-pregnancy BMI was…||You should gain approx..…|
|Less than 18.5 kg/m²18.5 to 24.9 kg/m²25 to 29.9 kg/m²Above 30 kg/m²||12½ to 18kg11½ to 16kg7 to 11½ kg5 to 9kg|
As well as having an overall weight gain goal for your pregnancy, there is a trimester by trimester guideline to follow.
First trimester: Most women can expect to gain 1-3 kg in the first trimester.
Second and Third trimesters: This depends on your pre-pregnancy BMI
|If your pre-pregnancy BMI was…||You should gain approx…|
|Less than 18.5 kg/m²||½ kg/week|
|18.5 to 24.9 kg/m²||400g/week|
|Above 25kg/m²||Less than 300g/ week|
It is important to try to keep your weight gain in this range for both your health and the health of your baby. If you don’t gain enough weight your baby may miss out on some important nutrients. This can cause problems later in life. Insufficient weight gain is also linked with preterm birth. Gaining too much weight during pregnancy can also cause problems such as high blood pressure, gestational diabetes, complications in delivery, and longer hospital stays for you or your baby. These problems can be harmful to both you and your baby.
(Information obtained from a consensus document developed by Queensland Dietitians www.health.gov.au)