Plain English Summary
Background and study aims
Pregnancies with big babies are associated with maternal complications, such as emergency caesarean section, post-partum hemorrhage (heavy bleeding after delivery) and perineal trauma and neonatal complications, including shoulder dystocia, brachial plexus injury (OBPI), fracture of humerus or clavicle and birth asphyxia. Despite the association of big babies with pregnancy complications as well as its relatively common occurrence in clinical practice, there is lack of a clear consensus regarding management of pregnancies with big babies with no guidance from professional bodies on either the identification, diagnosis nor management of when there is a diagnosis of a big baby during the pregnancy. The aims of our study are firstly, to compare the prevalence of pregnancy complications in pregnancies with big babies compared to those that are not; secondly, to determine whether complications in pregnancies with big babies can be predicted effectively from maternal and pregnancy characteristics and thirdly, in pregnancies that are deemed to be high risk, we aim to assess whether delivery at an earlier gestation is associated with a reduction in the incidence of adverse outcomes.
Who can participate?
Health records from singleton pregnancies with healthy babies from the last 8-9 years will be analysed.
What does the study involve?
The study is retrospectively analysing health records.
What are the possible benefits and risks of participating?
Where is the study run from?
Medway NHS Foundation Trust, Fetal Medicine Unit, Gillingham, Kent, ME7 5NY
When is the study starting and how long is it expected to run for?
January 2009 to March 2019
Who is funding the study?
Health Education England, Kent Surrey and Sussex
Who is the main contact?
Professor RanjitAkolekar, email@example.com
Maternal and neonatal outcomes in pregnancies with macrosomia
The aim of this study is firstly, to compare the prevalence of pregnancy complications in pregnancies with big babies compared to those that are not; secondly, to determine whether complications in pregnancies with big babies can be predicted effectively from maternal and pregnancy characteristics and thirdly, in pregnancies that are deemed to be high risk, we aim to assess whether delivery at an earlier gestation is associated with a reduction in the incidence of adverse outcomes.
Not provided at the time of registration
Awaiting approval from London - City & East Research Ethics Committee (Henry VIII Committee Room, St Bartholomew's Hospital, North Wing, EC1A 7BE; 0207 1048033; firstname.lastname@example.org), ref: 19/LO/0502 (IRAS ID 262280).
Retrospective cohort study
Primary study design
Secondary study design
Patient information sheet
None needed (retrospective study)
Pregnancy complications in big babies
This is a retrospective cohort study undertaken at the Fetal Medicine Unit at a large maternity unit in United Kingdom. In our unit, all women who book for their pregnancy care are offered routine scans at 11-13 weeks, 20-22 weeks and 35-37 weeks for assessment of fetal anatomy, fetal growth and well-being. At the 11-13 weeks’ and 20-22 weeks’ gestation, we record maternal demographic characteristics and obtain detailed medical and obstetric history to allow for risk assessment of pregnancies at risk of placental dysfunction. Women who are diagnosed with large for gestational age at 35-37 weeks are offered an additional scan at 39-40 weeks’ gestation to assess fetal growth and well-being.
There is a specific dedicated team of fellows and sonographers who are trained in advanced obstetric ultrasound scanning who carry out an ultrasound scan to assess fetal growth and well-being by examination of fetal biometry, amniotic fluid and feto-placental Dopplers. Women who have a diagnosis of large for gestational age pregnancies are referred to the Fetal Medicine Consultant for a discussion about the risks and benefits of timing and mode of delivery.
The inclusion criteria for this study will include singleton pregnancies during the study period and those that delivered a phenotypically normal neonate after 24 weeks’ gestation. We excluded multiple pregnancies, miscarriages, termination of pregnancies, those with major fetal defects and pregnancies lost to follow-up.
Primary outcome measure
The primary outcome measures were divided into maternal and neonatal complications.
1. Rates of emergency cesarean section, post-partum haemorrhage and obstetric anal sphincter injury (OASIS).
1. Rates of shoulder dystocia, obstetric brachial plexus injury, birth fractures and hypoxic-ischaemic encephalopathy.
Secondary outcome measures
Maternal secondary outcome measures:
1. Prolonged 1st and 2nd stage of labor
2. Instrumental vaginal delivery
3. Failed instrumental delivery requiring cesarean section
4. Emergency cesarean section for failure to progress.
Overall trial start date
Overall trial end date
Reason abandoned (if study stopped)
Participant inclusion criteria
1. Singleton pregnancies which booked and delivered at our hospital during the study period
2. Delivered phenotypically normal neonates at ≥ 24 weeks’ gestation
Target number of participants
Approximately 40,000 pregnancies, including about 4,000 with birthweight > 4,000g and about 500-600 with birthweight > 4,500 g.
Participant exclusion criteria
1. Multiple pregnancies
3. Terminations of pregnancy
4. Major fetal defects
5. Lost to follow-up
Recruitment start date
Recruitment end date
Countries of recruitment
Trial participating centre
Medway NHS Foundation Trust
Fetal Medicine Unit, Level 2, Green Zone, Windmill Road
Health Education England, Kent Surrey and Sussex
Funding Body Type
Funding Body Subtype
Results and Publications
Publication and dissemination plan
We aim to publish the data in peer-reviewed scientific journals.
IPD sharing statement:
The current data sharing plans for this study are unknown and will be available at a later date
Intention to publish date
Participant level data
To be made available at a later date
Basic results (scientific)