The Investigators will recruit 1800 women, aged 18-38 years, who are planning a pregnancy in the United Kingdom, Singapore and New Zealand. The participants will be randomly allocated to receive the standard nutritional drink or the study nutritional drink. Women who conceive between one and twelve months after starting the nutritional drink will be followed through pregnancy and studied with their babies for the first year after delivery. Various testing will be carried out at relevant time points. Mothers will undergo blood, urine, hair and cheek swab sampling, dual-energy X-ray absorptiometry (DXA) scans along with body measurements and health and lifestyle questionnaires. Infants will undergo hair, cheek swab, urine and stool sampling along with body measurements, measurements of body composition and a DXA scan.