 All the participants will have their deliveries in one of the NHS Hospitals involved in the study. Cord blood, a piece of cord and placental biopsies around 2cm each will be taken at the time of birth as well as detailed birth and neonatal outcome data and a stool sample from the baby shortly afterwards. Babys body fat content and distribution will be measured by the PEAPOD machine. This is a non invasive, baby friendly way of accurately measuring the fat distribution in the baby. This is optional. For mothers who have Caesarean sections for medicalobstetric reasons, we will ask for separate consent to take a sample of abdominal fat and subcutaneous as well as myometrial smooth muscle tissues. All the samples obtained will stored for future DNA isolation. 