I knew that anaesthetics depleted B12 stores but never thought about gas and air during labour. I consumed an entire tank when I had my son 19 years ago. I remember the midwife telling me off (but as she'd left me on my own with my husband for 6 hours, what did she expect??) No wonder I felt so awful for months afterwards.
I wonder how many new mums simply need a shot or three of B12?