Article History
Received: 28 March 2019
Accepted: 13 May 2020
First Online: 29 May 2020
Ethics approval and consent to participate
: This work was carried out in accordance with The Code of Ethics of the World Medical Association (Declaration of Helsinki) for experiments involving humans. Ethical approval was gained from the National Research Ethics Service NHS Health Research Authority London - City & East Research Ethics Committee Research Ethics Committee REC reference: 15/LO/2070.Women received an information leaflet about the study and, after speaking to the researcher, if they agreed to participate, they provided written informed consent to be weighed and have their weight recorded in their hand-held maternity notes at each antenatal visit throughout their pregnancy.
: Not applicable.
: The authors declare that they have no competing interests.