Growth scans play a pivotal role in ensuring the healthy progression of pregnancy by assessing the baby's growth, size, and overall development in the womb. These scans help healthcare providers identify potential issues or abnormalities early on, allowing for timely intervention and management if necessary.

1. When can I have a growth scan?

Growth scans can be performed in pregnancy usually between 24 and 36 weeks to check your baby is developing at the correct rate for your dates.

2. What does a growth scan measure?

A sonographer uses ultrasound to measure your baby's head, abdomen and thighbones and uses these measurements to calculate the estimated birth weight. Bear in mind that this is only an estimate and can vary by up to 25%. It also gets much more difficult to accurately measure your baby when they are bigger. Your sonographer can compare the measurements with the average for babies of the same gestation to check your baby's growth is in the normal range and identify if there may be a problem with your baby's growth.

A growth scan can also check the amount of amniotic fluid around the baby. Too much amniotic fluid or polyhydramnios has several causes including gestational diabetes in the mother and gut blockages in the baby. Having too little amniotic fluid (oligohydramnios) around the baby is a symptom associated with intra-uterine growth restriction (the medical name for poor fetal growth) - a condition that affects 3 in 100 babies. The two sometimes go together.

The majority of cases of poor fetal growth are caused by failure of the placenta, but other causes include infection and the demands of twins or multiple pregnancy. Checking blood flow from the umbilical cord to the placenta can reveal how well the placenta is functioning, if there are any problems, and identify the position of the placenta. All of these details are a useful source of information on your baby's general wellbeing.

3. Why has my doctor recommended a growth scan after everything was fine at my 20-week scan?

Don't panic! Your doctor is just doing their job and keeping a close eye on your baby's growth and development. If they've suggested a growth scan there will be sound medical reasons for doing so. Growth scans are usually recommended if there are concerns about the size of your baby, you've had complications in a previous pregnancy, or have a medical condition such as gestational diabetes, a type of diabetes where the body can't make enough insulin to meet the demands of pregnancy and where the danger is that your baby could grow too big. Pre-eclampsia, a type of high blood pressure that can affect blood supply to the placenta, is another condition that can restrict your baby's growth.

All of these conditions require close monitoring of you and your baby's health, and this may mean you are recommended to have a series of growth scans over a couple of weeks to check on your baby. In some cases, a growth problem may mean that your baby is delivered earlier than usual by caesarean section.

There are also other perfectly natural reasons why your baby may appear small for dates. All babies develop at slightly different rates, for instance. Others are small because their parents are small, or they may just be lying in an unusual position. If your baby is close to full-term it may just be that their head is engaged in your pelvis and can't be measured accurately.

So there's no need to worry if your doctor suggests a Growth Scan.

4. Is it safe to have multiple growth scans?

Ultrasound scanning technology has been used routinely now for many decades in pregnant women and no adverse effects have been identified. Ultrasound scans remain the safest way of checking the health of your unborn baby.